106-644: Clay Cross Tunnel is a 1,784 yards (1,631 m) tunnel on the Midland Main Line line near Clay Cross in Derbyshire , England . It was the most substantial single civil engineering feature present on the North Midland Railway and was one of the more ambitious railway tunnels to be built during the early development of Britain's railway network. Built to a design produced by the pioneering railway engineers George Stephenson and Robert Stephenson ,
212-695: A canal . The central portions of a rapid transit network are usually in the tunnel. Some tunnels are used as sewers or aqueducts to supply water for consumption or for hydroelectric stations. Utility tunnels are used for routing steam, chilled water, electrical power or telecommunication cables, as well as connecting buildings for convenient passage of people and equipment. Secret tunnels are built for military purposes, or by civilians for smuggling of weapons , contraband , or people . Special tunnels, such as wildlife crossings , are built to allow wildlife to cross human-made barriers safely. Tunnels can be connected together in tunnel networks . A tunnel
318-845: A civil war in 739 that lasted until 743 known as the Berber Revolt . The Berbers revolted against the Umayyads , putting an end to Eastern dominion over the Maghreb. Despite racial tensions, Arabs and Berbers intermarried frequently. A few years later, the Eastern branch of the Umayyad dynasty was dethroned by the Abbasids and the Umayyad Caliphate overthrown in the Abbasid revolution (746–750) . Abd al-Rahman I , who
424-663: A broader sense to refer to Muslims in general, especially those of Arab or Berber descent, whether living in al-Andalus or North Africa. During the colonial era, the Portuguese introduced the names " Ceylon Moors " and " Indian Moors " in South Asia and Sri Lanka , now official ethnic designations on the island nation, and the Bengali Muslims were also called Moors. In the Philippines, the longstanding Muslim community, which predates
530-496: A few days. However, according to the railway historian Cliff Williams, the tunnel was not actually completed until 18 December 1839. It begins at the former Derbyshire summit of the line, also the highest point of the whole line, just after the old Stretton railway station . Situated at the watershed of the rivers Amber and Rother . Clay Cross is directly above it and there are ventilation shafts in Market Street (around which
636-505: A hereditary trait with them; all but Sulaiman al-Zafir (God have mercy on him!), whom I remember to have had black ringlets and a black beard. As for al-Nasir and al-Hakam al-Mustansir (may God be pleased with them!), I have been informed by my late father, the vizier, as well as by others, that both of them were blond and blue-eyed. The same is true of Hisham al-Mu'aiyad , Muhammad al-Mahdi, and `Abd al-Rahman al-Murtada (may God be merciful to them all!); I saw them myself many times, and had
742-512: A high level of religious conversion (whether voluntary or enforced), driven by historical episodes of social and religious intolerance, that ultimately led to the integration of descendants." According to historian Richard A. Fletcher , "the number of Arabs who settled in Iberia was very small. 'Moorish' Iberia does at least have the merit of reminding us that the bulk of the invaders and settlers were Moors, i.e., Berbers from Algeria and Morocco." In
848-449: A large factor in the decision making process. Civil engineers usually use project management techniques for developing a major structure. Understanding the amount of time the project requires, and the amount of labor and materials needed is a crucial part of project planning. The project duration must be identified using a work breakdown structure and critical path method . Also, the land needed for excavation and construction staging, and
954-461: A pipe jack, with the span of some box jacks in excess of 20 metres (66 ft). A cutting head is normally used at the front of the box being jacked, and spoil removal is normally by excavator from within the box. Recent developments of the Jacked Arch and Jacked deck have enabled longer and larger structures to be installed to close accuracy. There are also several approaches to underwater tunnels,
1060-421: A specialized method called clay-kicking for digging tunnels in clay-based soils. The clay-kicker lies on a plank at a 45-degree angle away from the working face and rather than a mattock with his hands, inserts with his feet a tool with a cup-like rounded end, then turns the tool with his hands to extract a section of soil, which is then placed on the waste extract. Clay-kicking is a specialized method developed in
1166-434: A tube can be sunk into a body of water, which is called an immersed tunnel. Cut-and-cover is a simple method of construction for shallow tunnels where a trench is excavated and roofed over with an overhead support system strong enough to carry the load of what is to be built above the tunnel. There are two basic forms of cut-and-cover tunnelling: Shallow tunnels are often of the cut-and-cover type (if under water, of
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#17328514925941272-710: A tunnel than a sufficiently strong bridge). Some water crossings are a mixture of bridges and tunnels, such as the Denmark to Sweden link and the Chesapeake Bay Bridge-Tunnel in Virginia . There are particular hazards with tunnels, especially from vehicle fires when combustion gases can asphyxiate users, as happened at the Gotthard Road Tunnel in Switzerland in 2001. One of the worst railway disasters ever,
1378-432: A tunnel. Bridges usually require a larger footprint on each shore than tunnels. In areas with expensive real estate, such as Manhattan and urban Hong Kong , this is a strong factor in favor of a tunnel. Boston's Big Dig project replaced elevated roadways with a tunnel system to increase traffic capacity, hide traffic, reclaim land, redecorate, and reunite the city with the waterfront. The 1934 Queensway Tunnel under
1484-454: Is allowed in this tunnel tube, and motorcyclists are directed to the other tube. Each level was built with a three-lane roadway, but only two lanes per level are used – the third serves as a hard shoulder within the tunnel. The A86 Duplex is Europe's longest double-deck tunnel. Moorish The term Moor is an exonym first used by Christian Europeans to designate the Muslim populations of
1590-405: Is composed of rock-faced stone and ashlar. The south portal, which is also Grade II listed, comprises an arch is formed of two ashlar bands of roll moulding profile. The portal is flanked by broad masonry buttresses , beyond which are extensive masonry retaining walls . It is composed of squared quarry-faced Derbyshire gritstone with both moulded and tooled ashlar gritstone dressings. The design
1696-500: Is intended to carry both the Istanbul metro and a two-level highway, over a length of 6.5 km (4.0 miles). The French A86 Duplex Tunnel [ fr ] in west Paris consists of two bored tunnel tubes, the eastern one of which has two levels for light motorized vehicles, over a length of 10 km (6.2 miles). Although each level offers a physical height of 2.54 m (8.3 ft), only traffic up to 2 m (6.6 ft) tall
1802-712: Is presumably of Phoenician origin. Some sources attribute a Hebrew origin to the word. During the classical period, the Romans interacted with, and later conquered, parts of Mauretania , a state that covered modern northern Morocco , western Algeria , and the Spanish cities Ceuta and Melilla . The Berber tribes of the region were noted in the Classics as Mauri , which was subsequently rendered as "Moors" in English and in related variations in other European languages. Mauri (Μαῦροι)
1908-655: Is recorded as the native name by Strabo in the early 1st century. This appellation was also adopted into Latin, whereas the Greek name for the tribe was Maurusii ( Ancient Greek : Μαυρούσιοι ). The Moors were also mentioned by Tacitus as having revolted against the Roman Empire in 24 AD . During the Latin Middle Ages, Mauri was used to refer to Berbers and Arabs in the coastal regions of Northwest Africa. The 16th century scholar Leo Africanus (c. 1494–1554) identified
2014-487: Is relatively long and narrow; the length is often much greater than twice the diameter , although similar shorter excavations can be constructed, such as cross passages between tunnels. The definition of what constitutes a tunnel can vary widely from source to source. For example, in the United Kingdom, a road tunnel is defined as "a subsurface highway structure enclosed for a length of 150 metres (490 ft) or more." In
2120-401: Is sometimes necessary during the excavation of a tunnel. They are usually circular and go straight down until they reach the level at which the tunnel is going to be built. A shaft normally has concrete walls and is usually built to be permanent. Once the access shafts are complete, TBMs are lowered to the bottom and excavation can start. Shafts are the main entrance in and out of the tunnel until
2226-515: Is that the open building pit is muted after tunnel construction; no roof is placed. Some tunnels are double-deck, for example, the two major segments of the San Francisco–Oakland Bay Bridge (completed in 1936) are linked by a 160-metre (540 ft) double-deck tunnel section through Yerba Buena Island , the largest-diameter bored tunnel in the world. At construction this was a combination bidirectional rail and truck pathway on
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#17328514925942332-673: Is the Siloam Tunnel , built in Jerusalem by the kings of Judah around the 8th century BC. Another tunnel excavated from both ends, maybe the second known, is the Tunnel of Eupalinos , which is a tunnel aqueduct 1,036 m (3,400 ft) long running through Mount Kastro in Samos , Greece. It was built in the 6th century BC to serve as an aqueduct . In Ethiopia , the Siqurto foot tunnel , hand-hewn in
2438-680: The Reconquista ("Reconquest") soon after the Islamic conquest in the 8th century. Christian states based in the north and west slowly extended their power over the rest of Iberia. The Kingdom of Navarre , the Kingdom of Galicia , the Kingdom of León , the Kingdom of Portugal , the Kingdom of Aragon , the Marca Hispánica , and the Crown of Castile began a process of expansion and internal consolidation during
2544-612: The Aghlabid Moors occupied Mazara on Sicily , developing it as a port. They eventually went on to consolidate the rest of the island . Differences in religion and culture led to a centuries-long conflict with the Christian kingdoms of Europe , which tried to reclaim control of Muslim areas; this conflict was referred to as the Reconquista . In 1224, the Muslims were expelled from Sicily to
2650-596: The Azawagh Arabs , after the Azawagh region of the Sahara. The authoritative dictionary of the Spanish language does not list any derogatory meaning for the word moro , a term generally referring to people of Maghrebian origin in particular or Muslims in general. Some authors have pointed out that in modern colloquial Spanish use of the term moro is derogatory for Moroccans in particular and Muslims in general. In
2756-556: The Balvano train disaster , was caused by a train stalling in the Armi tunnel in Italy in 1944, killing 426 passengers. Designers try to reduce these risks by installing emergency ventilation systems or isolated emergency escape tunnels parallel to the main passage. Government funds are often required for the creation of tunnels. When a tunnel is being planned or constructed, economics and politics play
2862-581: The Bangsamoro "Moro Nation". Moreno can mean "dark-skinned" in Spain, Portugal, Brazil, and the Philippines. Also in Spanish, morapio is a humorous name for "wine", especially that which has not been "baptized" or mixed with water, i.e., pure unadulterated wine. Among Spanish speakers, moro came to have a broader meaning, applied to both Filipino Moros from Mindanao, and the moriscos of Granada . Moro refers to all things dark, as in "Moor", moreno , etc. It
2968-489: The Clay Cross Company , to exploit it. It would be a major local employer for the next 150 years. Construction began on 2 February 1837 when the first sod was turned for the sinking of the ventilation shaft in the centre of the tunnel. The boring of the tunnel was not straightforward, eventually costing £140,000 (equivalent to £15,560,000 in 2023), instead of the expected £98,000 (equivalent to £10,890,000 in 2023), with
3074-487: The Crusades , as a pun on the bearer's name in the canting arms of Morese, Negri, Saraceni, etc., or in the case of Frederick II , possibly to demonstrate the reach of his empire. The arms of Pope Benedict XVI feature a moor's head, crowned and collared red, in reference to the arms of Freising, Germany . In the case of Corsica and Sardinia, the blindfolded moors' heads in the four quarters have long been said to represent
3180-837: The Inquisition in Spain . The Muslim population of Granada rebelled in 1499 . The revolt lasted until early 1501, giving the Castilian authorities an excuse to void the terms of the Treaty of Granada (1491) . In 1501, Castilian authorities delivered an ultimatum to the Muslims of Granada: they could either convert to Christianity or be expelled. The Inquisition was aimed mostly at Jews and Muslims who had overtly converted to Christianity but were thought to be practicing their faiths secretly. They were respectively called marranos and moriscos . However, in 1567 King Philip II directed Moriscos to give up their Arabic names and traditional dress, and prohibited
3286-610: The Isma'ili rulers of the Fatimid Caliphate . Four years later, the Fatimid governor was ousted from Palermo when the island declared its independence under Emir Ahmed ibn-Kohrob. The language spoken in Sicily under Muslim rule was Siculo-Arabic . In 1038, a Byzantine army under George Maniakes crossed the strait of Messina. This army included a corps of Normans that saved the situation in
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3392-585: The Maghreb , al-Andalus ( Iberian Peninsula ), Sicily and Malta during the Middle Ages . Moors are not a single, distinct or self-defined people. The 1911 Encyclopædia Britannica observed that the term had "no real ethnological value." Europeans of the Middle Ages and the early modern period variously applied the name to Arabs , Berbers , and Muslim Europeans . The term has also been used in Europe in
3498-666: The Midland Railway 's system. Tunnel A tunnel is an underground or undersea passageway. It is dug through surrounding soil, earth or rock, or laid under water, and is usually completely enclosed except for the two portals common at each end, though there may be access and ventilation openings at various points along the length. A pipeline differs significantly from a tunnel, though some recent tunnels have used immersed tube construction techniques rather than traditional tunnel boring methods. A tunnel may be for foot or vehicular road traffic , for rail traffic, or for
3604-610: The Philippines , a former Spanish colony , many modern Filipinos call the large, local Muslim minority concentrated in Mindanao and other southern islands Moros . The word is a catch-all term, as Moro may come from several distinct ethno-linguistic groups such as the Maranao people . The term was introduced by Spanish colonisers, and has since been appropriated by Filipino Muslims as an endonym , with many self-identifying as members of
3710-464: The Port Authority of New York and New Jersey was not aware of this bill and had not asked for a grant for such a project. Increased taxes to finance a large project may cause opposition. Tunnels are dug in types of materials varying from soft clay to hard rock. The method of tunnel construction depends on such factors as the ground conditions, the groundwater conditions, the length and diameter of
3816-797: The Queens-Midtown Tunnel between Manhattan and the borough of Queens on Long Island ; the Detroit-Windsor Tunnel between Michigan and Ontario ; and the Elizabeth River tunnels between Norfolk and Portsmouth, Virginia ; the 1934 River Mersey road Queensway Tunnel ; the Western Scheldt Tunnel , Zeeland, Netherlands; and the North Shore Connector tunnel in Pittsburgh, Pennsylvania . The Sydney Harbour Tunnel
3922-466: The River Mersey at Liverpool was chosen over a massively high bridge partly for defense reasons; it was feared that aircraft could destroy a bridge in times of war, not merely impairing road traffic but blocking the river to navigation. Maintenance costs of a massive bridge to allow the world's largest ships to navigate under were considered higher than for a tunnel. Similar conclusions were reached for
4028-669: The Strait of Gibraltar onto the Iberian Peninsula , and in a series of raids they conquered Visigothic Christian Hispania . Their general, Tariq ibn Ziyad , brought most of Iberia under Islamic rule in an eight-year campaign. They continued northeast across the Pyrenees Mountains but were defeated by the Franks under Charles Martel at the Battle of Tours in 732. The Maghreb fell into
4134-665: The United Kingdom of digging tunnels in strong clay-based soil structures. This method of cut and cover construction required relatively little disturbance of property during the renewal of the United Kingdom's then ancient sewerage systems. It was also used during the First World War by Royal Engineer tunnelling companies placing mines beneath German lines, because it was almost silent and so not susceptible to listening methods of detection. Tunnel boring machines (TBMs) and associated back-up systems are used to highly automate
4240-591: The canton of Glarus . The borehole has a diameter of 8.03 metres (26.3 ft). The four TBMs used for excavating the 57-kilometre (35 mi) Gotthard Base Tunnel , in Switzerland , had a diameter of about 9 metres (30 ft). A larger TBM was built to bore the Green Heart Tunnel (Dutch: Tunnel Groene Hart) as part of the HSL-Zuid in the Netherlands, with a diameter of 14.87 metres (48.8 ft). This in turn
4346-520: The settlement of Lucera , which was destroyed by European Christians in 1300. The fall of Granada in 1492 marked the end of Muslim rule in Spain, although a Muslim minority persisted until their expulsion in 1609. The etymology of the word "Moor" is uncertain, although it can be traced back to the Phoenician term Mahurin , meaning "Westerners". From Mahurin , the ancient Greeks derive Mauro , from which Latin derives Mauri . The word "Moor"
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4452-486: The water table . This pressurizes the ground ahead of the TBM cutter head to balance the water pressure. The operators work in normal air pressure behind the pressurized compartment, but may occasionally have to enter that compartment to renew or repair the cutters. This requires special precautions, such as local ground treatment or halting the TBM at a position free from water. Despite these difficulties, TBMs are now preferred over
4558-689: The 16th century as a metaphor for a narrow, confined space like the inside of a cask. Some of the earliest tunnels used by humans were paleoburrows excavated by prehistoric mammals. Much of the early technology of tunneling evolved from mining and military engineering . The etymology of the terms "mining" (for mineral extraction or for siege attacks ), " military engineering ", and " civil engineering " reveals these deep historic connections. Predecessors of modern tunnels were adits that transported water for irrigation , drinking, or sewerage . The first qanats are known from before 2000 BC. The earliest tunnel known to have been excavated from both ends
4664-638: The 1960s. The main idea of this method is to use the geological stress of the surrounding rock mass to stabilize the tunnel, by allowing a measured relaxation and stress reassignment into the surrounding rock to prevent full loads becoming imposed on the supports. Based on geotechnical measurements, an optimal cross section is computed. The excavation is protected by a layer of sprayed concrete, commonly referred to as shotcrete . Other support measures can include steel arches, rock bolts, and mesh. Technological developments in sprayed concrete technology have resulted in steel and polypropylene fibers being added to
4770-687: The 1971 Kingsway Tunnel under the Mersey. In Hampton Roads, Virginia , tunnels were chosen over bridges for strategic considerations; in the event of damage, bridges might prevent US Navy vessels from leaving Naval Station Norfolk . Water-crossing tunnels built instead of bridges include the Seikan Tunnel in Japan; the Holland Tunnel and Lincoln Tunnel between New Jersey and Manhattan in New York City ;
4876-746: The Algarve ". The Moorish Kingdom of Granada continued for three more centuries in southern Iberia. On 2 January 1492, the leader of the last Muslim stronghold in Granada surrendered to the armies of a recently united Christian Spain (after the marriage of Ferdinand II of Aragón and Isabella I of Castile , the " Catholic Monarchs "). The Moorish inhabitants received no military aid or rescue from other Muslim nations. The remaining Jews were also forced to leave Spain, convert to Roman Catholic Christianity, or be killed for refusing to do so. In 1480, to exert social and religious control, Isabella and Ferdinand agreed to allow
4982-514: The Islamic territory in Iberia fell under the rule of the Almohad Caliphate in 1153. This second stage was guided by a version of Islam that left behind the more tolerant practices of the past. Al-Andalus broke up into a number of taifas (fiefs), which were partly consolidated under the Caliphate of Córdoba. The Kingdom of Asturias , a small northwestern Christian Iberian kingdom, initiated
5088-533: The Middle Ages, crosses a mountain ridge. In the Gaza Strip , the network of tunnels was used by Jewish strategists as rock-cut shelters, in first links to Judean resistance against Roman rule in the Bar Kokhba revolt during the 2nd century AD. A major tunnel project must start with a comprehensive investigation of ground conditions by collecting samples from boreholes and by other geophysical techniques. An informed choice can then be made of machinery and methods for excavation and ground support, which will reduce
5194-616: The Middle Ages. The term ascribed to them in Anglo-Norman blazon (the language of English heraldry ) is maure , though they are also sometimes called moore , blackmoor , blackamoor or negro . Maures appear in European heraldry from at least as early as the 13th century, and some have been attested as early as the 11th century in Italy , where they have persisted in the local heraldry and vexillology well into modern times in Corsica and Sardinia . Armigers bearing moors or moors' heads may have adopted them for any of several reasons, to include symbolizing military victories in
5300-430: The Moors ( Mauri ) as the native Berber inhabitants of the former Roman Africa Province ( Roman Africans ). In medieval Romance languages , variations of the Latin word for the Moors (for instance, Italian and Spanish : moro , French : maure , Portuguese : mouro , Romanian : maur ) developed different applications and connotations. The term initially denoted a specific Berber people in western Libya , but
5406-614: The Moors were dominant between 711 and 1492. The best surviving examples of this architectural tradition are the Mosque–Cathedral of Córdoba and the Alhambra in Granada (mainly 1338–1390), as well as the Giralda in Seville (1184). Other notable examples include the ruined palace city of Medina Azahara (936–1010) and the Mosque of Cristo de la Luz , now a church, in Toledo , the Aljafería in Zaragoza and baths such as those at Ronda and Alhama de Granada . Moors—or more frequently their heads, often crowned—appear with some frequency in medieval European heraldry , though less so since
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#17328514925945512-423: The United States, the NFPA definition of a tunnel is "An underground structure with a design length greater than 23 m (75 ft) and a diameter greater than 1,800 millimetres (5.9 ft)." The word "tunnel" comes from the Middle English tonnelle , meaning "a net", derived from Old French tonnel , a diminutive of tonne ("cask"). The modern meaning, referring to an underground passageway, evolved in
5618-420: The arrival of the Spanish, now self-identifies as the " Moro people ", an exonym introduced by Spanish colonizers due to their Muslim faith. In 711, troops mostly formed by Moors from northern Africa led the Umayyad conquest of Hispania . The Iberian Peninsula then came to be known in Classical Arabic as al-Andalus, which at its peak included most of Septimania and modern-day Spain and Portugal . In 827,
5724-400: The blocky nature of rocks, the exact location of fault zones, or the stand-up times of softer ground. This may be a particular concern in large-diameter tunnels. To give more information, a pilot tunnel (or "drift tunnel") may be driven ahead of the main excavation. This smaller tunnel is less likely to collapse catastrophically should unexpected conditions be met, and it can be incorporated into
5830-431: The completion of design work during November 1836, tenders for the work were issued by the North Midland Railway one month later. The contractors appointed for the project were Messrs. Hardy, Copeland and Cropper of Watford, who would construct the tunnel, including the cutting and excavation, for the sum of £105,400 (equivalent to £12,100,000 in 2023), and construction commenced in February 1837. The excavation of
5936-451: The concrete mix to improve lining strength. This creates a natural load-bearing ring, which minimizes the rock's deformation . By special monitoring the NATM method is flexible, even at surprising changes of the geomechanical rock consistency during the tunneling work. The measured rock properties lead to appropriate tools for tunnel strengthening . In pipe jacking , hydraulic jacks are used to push specially made pipes through
6042-523: The continuation of further conquest, but an Arab assault took Carthage and held it against a Byzantine counterattack. Although a Christian and pagan Berber rebellion pushed out the Arabs temporarily, the Romanized urban population preferred the Arabs to the Berbers and welcomed a renewed and final conquest that left northern Africa in Muslim hands by 698. Over the next decades, the Berber and urban populations of northern Africa gradually converted to Islam, although for separate reasons. The Arabic language
6148-462: The council have placed seats) and High Street (some 150 feet (46 m) above the line). The northern portal features a Moorish -inspired aethetic and is presently a Grade II listed structure. It has castellated embattlements and a pair of tapering octagonal towers. These towers, which have sloping ashlar bases, feature decoratively arrowslits . The portal itself ia an elliptical arch with rounded mouldings and projecting castellated parapets. It
6254-409: The entire tunnelling process, reducing tunnelling costs. In certain predominantly urban applications, tunnel boring is viewed as a quick and cost-effective alternative to laying surface rails and roads. Expensive compulsory purchase of buildings and land, with potentially lengthy planning inquiries, is eliminated. Disadvantages of TBMs arise from their usually large size – the difficulty of transporting
6360-441: The final tunnel or used as a backup or emergency escape passage. Alternatively, horizontal boreholes may sometimes be drilled ahead of the advancing tunnel face. Other key geotechnical factors: For water crossings, a tunnel is generally more costly to construct than a bridge. However, both navigational and traffic considerations may limit the use of high bridges or drawbridges intersecting with shipping channels, necessitating
6466-400: The first clash against the Muslims from Messina. After another decisive victory in the summer of 1040, Maniaces halted his march to lay siege to Syracuse . Despite his success, Maniaces was removed from his position, and the subsequent Muslim counter-offensive reconquered all the cities captured by the Byzantines. The Norman Robert Guiscard , son of Tancred, invaded Sicily in 1060. The island
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#17328514925946572-445: The former lower or untouchable castes) to Islam or descendants of a marriage alliance between a Middle Eastern individual and an Indian woman. Within the context of Portuguese colonization , in Sri Lanka ( Portuguese Ceylon ), Muslims of Arab origin are called Ceylon Moors , not to be confused with "Indian Moors" of Sri Lanka (see Sri Lankan Moors ). Sri Lankan Moors (a combination of "Ceylon Moors" and "Indian Moors") make up 12% of
6678-466: The four Moorish emirs who were defeated by Peter I of Aragon and Pamplona in the 11th century, the four moors' heads around a cross having been adopted to the arms of Aragon around 1281–1387, and Corsica and Sardinia having come under the dominion of the king of Aragon in 1297. In Corsica, the blindfolds were lifted to the brow in the 18th century as a way of expressing the island's newfound independence. The use of Moors (and particularly their heads) as
6784-405: The ground behind a TBM or shield. This method is commonly used to create tunnels under existing structures, such as roads or railways. Tunnels constructed by pipe jacking are normally small diameter bores with a maximum size of around 3.2 metres (10 ft). Box jacking is similar to pipe jacking, but instead of jacking tubes, a box-shaped tunnel is used. Jacked boxes can be a much larger span than
6890-429: The honour of being received by them, and I remarked that they all had fair hair and blue eyes. The languages spoken in the parts of the Iberian Peninsula under Muslim rule were Andalusian Arabic and Mozarabic ; they became extinct after the expulsion of the Moriscos , but Arabic language influence on the Spanish language can still be found today. The Muslims were resisted in parts of the Iberian Peninsula in areas of
6996-587: The immersed-tube type), while deep tunnels are excavated, often using a tunnelling shield . For intermediate levels, both methods are possible. Large cut-and-cover boxes are often used for underground metro stations, such as Canary Wharf tube station in London. This construction form generally has two levels, which allows economical arrangements for ticket hall, station platforms, passenger access and emergency egress, ventilation and smoke control, staff rooms, and equipment rooms. The interior of Canary Wharf station has been likened to an underground cathedral, owing to
7102-399: The incentives put in place by Fredrich II. Some Muslims from Lucera would also later convert due to oppression on the mainland and had their property returned to them and returned to Sicily. During the reigns of Frederick II as well as his son, Manfred , a large amount of Muslims were brought, as slaves, to farm lands and perform domestic labor. Enslaved persons in Sicily were not afforded
7208-435: The inevitable smoke and steam. A major disadvantage of cut-and-cover is the widespread disruption generated at the surface level during construction. This, and the availability of electric traction, brought about London Underground's switch to bored tunnels at a deeper level towards the end of the 19th century. Prior to the replacement of manual excavation by the use of boring machines, Victorian tunnel excavators developed
7314-468: The large TBM to the site of tunnel construction, or (alternatively) the high cost of assembling the TBM on-site, often within the confines of the tunnel being constructed. There are a variety of TBM designs that can operate in a variety of conditions, from hard rock to soft water-bearing ground. Some TBMs, the bentonite slurry and earth-pressure balance types, have pressurized compartments at the front end, allowing them to be used in difficult conditions below
7420-488: The last Arab strongholds, fell to the Christians. Islamic authors noted the tolerance of the Norman kings of Sicily. Ali ibn al-Athir wrote: "They [the Muslims] were treated kindly, and they were protected, even against the Franks . Because of that, they had great love for King Roger." The Muslim problem characterized Hohenstaufen rule in Sicily under Holy Roman Emperors Henry VI and his son, Frederick II . Many repressive measures were introduced by Frederick II to appease
7526-425: The late 1830s, construction of the North Midland Railway was underway. Seeking to avoid steep gradients along the line, it became apparent that a tunnel would be required near to Clay Cross. It was designed by the accomplished civil engineers George Stephenson and Robert Stephenson along with their assistant engineer Frederick Swanwick . The tunnel was originally estimated to cost £96,000 to construct. Following
7632-489: The loss of fifteen lives. The tunnel was to be 29 feet (8.8 m) wide and 25 feet 11 inches (7.90 m) high with a bed of broken stone at the base 4 feet (1.2 m) deep to form the rail bed. The tunnel was to be arched completely round with brickwork laid in Roman cement 18 inches (46 cm) deep in the roof and walls, and 14 inches (36 cm) deep in the floor. Approximately 15 million bricks were required for
7738-607: The lower deck with automobiles above, now converted to one-way road vehicle traffic on each deck. In Turkey, the Eurasia Tunnel under the Bosphorus , opened in 2016, has at its core a 5.4 km (3.4 miles) two-deck road tunnel with two lanes on each deck. Additionally, in 2015 the Turkish government announced that it will build three -level tunnel, also under the Bosporus. The tunnel
7844-756: The meantime, Spanish and Portuguese expeditions westward from the New World spread Christianity to India, the Malay Peninsula , Indonesia , and the Philippines . By 1521, the ships of Magellan had reached that island archipelago, which they named Las Islas Filipinas , after Philip II of Spain . In Mindanao , the Spaniards named the kris -bearing people as Moros or 'Moors'. Today this ethnic group in Mindanao, who are generally Filipino Muslim, are called "Moros". The first Muslim conquest of Sicily began in 827, though it
7950-562: The name acquired more general meaning during the medieval period, associated with " Muslim ", similar to associations with " Saracens ". During the context of the Crusades and the Reconquista , the term Moors included the derogatory suggestion of "infidels". Apart from these historic associations and context, Moor and Moorish designate a specific ethnic group speaking Hassaniya Arabic . They inhabit Mauritania and parts of Algeria , Western Sahara , Tunisia , Morocco , Niger , and Mali . In Niger and Mali, these peoples are also known as
8056-663: The name moor is applied to unbaptized children, meaning not Christian. In Basque , mairu means moor and also refers to a mythical people. Muslims located in South Asia were distinguished by the Portuguese historians into two groups: Mouros da Terra ("Moors of the Land") and the Mouros da Arabia/Mouros de Meca ("Moors from Arabia/Mecca" or "Paradesi Muslims"). The Mouros da Terra were either descendants of any native convert (mostly from any of
8162-510: The next several centuries under the flag of Reconquista. In 1212, a coalition of Christian kings under the leadership of Alfonso VIII of Castile drove the Muslims from Central Iberia. The Portuguese side of the Reconquista ended in 1249 with the conquest of the Algarve ( Arabic : الغرب – al-Gharb ) under Afonso III . He was the first Portuguese monarch to claim the title " King of Portugal and
8268-735: The northwest (such as Asturias , where they were defeated at the battle of Covadonga ) and the largely Basque Country in the Pyrenees . Though the number of Moorish colonists was small, many native Iberian inhabitants converted to Islam . By 1000, according to Ronald Segal , some 5,000,000 of Iberia's 7,000,000 inhabitants, most of them descended from indigenous Iberian converts, were Muslim. There were also Sub-Saharan Africans who had been absorbed into al-Andalus to be used as soldiers and slaves . The Berber and Sub-Saharan African soldiers were known as "tangerines" because they were imported through Tangier . The Caliphate of Córdoba collapsed in 1031 and
8374-483: The older method of tunnelling in compressed air, with an airlock/decompression chamber some way back from the TBM, which required operators to work in high pressure and go through decompression procedures at the end of their shifts, much like deep-sea divers . In February 2010, Aker Wirth delivered a TBM to Switzerland, for the expansion of the Linth–Limmern Power Stations located south of Linthal in
8480-540: The operation of empty and loaded trains at the same time. The temporary way is replaced by the permanent way at completion, thus explaining the term " Perway ". The vehicles or traffic using a tunnel can outgrow it, requiring replacement or enlargement: An open building pit consists of a horizontal and a vertical boundary that keeps groundwater and soil out of the pit. There are several potential alternatives and combinations for (horizontal and vertical) building pit boundaries. The most important difference with cut-and-cover
8586-478: The popes, who were intolerant of Islam in the heart of Christendom . This resulted in a rebellion by Sicilian Muslims, which in turn triggered organized resistance and systematic reprisals and marked the final chapter of Islam in Sicily. The complete eviction of Muslims and the annihilation of Islam in Sicily was completed by the late 1240s when the final deportations to Lucera took place. The remaining population of Sicilian Muslims converted to Catholicism due to
8692-730: The population. The Ceylon Moors (unlike the Indian Moors) are descendants of Arab traders who settled there in the mid-6th century. When the Portuguese arrived in the early 16th century, they labelled all the Muslims in the island as Moors as they saw some of them resembling the Moors in North Africa. The Sri Lankan government continues to identify the Muslims in Sri Lanka as "Sri Lankan Moors", sub-categorised into "Ceylon Moors" and "Indian Moors". The Goan Muslims —a minority community who follow Islam in
8798-510: The project is completed. If a tunnel is going to be long, multiple shafts at various locations may be bored so that entrance to the tunnel is closer to the unexcavated area. Once construction is complete, construction access shafts are often used as ventilation shafts , and may also be used as emergency exits. The New Austrian Tunnelling method (NATM)—also referred to as the Sequential Excavation Method (SEM) —was developed in
8904-485: The proper machinery must be selected. Large infrastructure projects require millions or even billions of dollars, involving long-term financing, usually through issuance of bonds . The costs and benefits for an infrastructure such as a tunnel must be identified. Political disputes can occur, as in 2005 when the US House of Representatives approved a $ 100 million federal grant to build a tunnel under New York Harbor. However,
9010-471: The region. After an interlude, during which the Muslims fought a civil war , the invasions resumed in 665, seizing Byzantine North Africa up to Bugia over the course of a series of campaigns, lasting until 689. A Byzantine counterattack largely expelled the Arabs but left the region vulnerable. Intermittent war over the inland provinces of North Africa continued for the next two decades. Further civil war delayed
9116-482: The risk of encountering unforeseen ground conditions. In planning the route, the horizontal and vertical alignments can be selected to make use of the best ground and water conditions. It is common practice to locate a tunnel deeper than otherwise would be required, in order to excavate through solid rock or other material that is easier to support during construction. Conventional desk and preliminary site studies may yield insufficient information to assess such factors as
9222-628: The same privileges as the Muslims in mainland Italy. The trend of importing a considerable amount of slaves from the Muslim world did not stop with the Hohenstaufen but was amplified under the Aragonese and Spanish crowns , and was in fact continued until as late as 1838 The majority of which would also come receive the label 'Moors' Moorish architecture is the articulated Islamic architecture of northern Africa and parts of Spain and Portugal, where
9328-528: The sheer size of the excavation. This contrasts with many traditional stations on London Underground , where bored tunnels were used for stations and passenger access. Nevertheless, the original parts of the London Underground network, the Metropolitan and District Railways, were constructed using cut-and-cover. These lines pre-dated electric traction and the proximity to the surface was useful to ventilate
9434-400: The tunnel drive, the depth of the tunnel, the logistics of supporting the tunnel excavation, the final use and the shape of the tunnel and appropriate risk management. There are three basic types of tunnel construction in common use. Cut-and-cover tunnels are constructed in a shallow trench and then covered over. Bored tunnels are constructed in situ, without removing the ground above. Finally,
9540-413: The tunnel lining. The greatest depth below the surface was about 48 yards (44 m). The tunnel bore was 1631m in length. A contract drawing shows the width of the tunnel bore to be 29ft at its widest point, and 25ft 11inches from the track bed to the roof of the tunnel. During August 1839, it was reported that excavation of the tunnel had been completed, and the final brick was expected to be laid within
9646-514: The tunnel was constructed between February 1837 and August 1839 at a total cost of £105,460. Mid-way through the tunnel's excavation, the alignment had to be changed due to previously undiscovered seams of coal as well as iron ore; their presence led to the creation of a neighbouring colliery and iron works by George Stephenson. Many elements of the tunnel, such as the Grade II listed portals, have remained unaltered since their completion. During
9752-405: The tunnel was impacted by unexpected geological factors ; both rich seams of coal seams and quantities of iron ore were encountered. As a result of this discovery, the alignment of the tunnel was changed. Another consequence of this discovery was George Stephenson's decision to open a colliery and iron works nearby, establishing a new company, George Stephenson and Co. , subsequently renamed
9858-428: The two most common being bored tunnels or immersed tubes , examples are Bjørvika Tunnel and Marmaray . Submerged floating tunnels are a novel approach under consideration; however, no such tunnels have been constructed to date. During construction of a tunnel it is often convenient to install a temporary railway, particularly to remove excavated spoil , often narrow gauge so that it can be double track to allow
9964-683: The usage of the collective term. The term has been applied at times to urban and coastal populations of the Maghreb , the term in these regions nowadays is rather used to denote the Arab-Berber populations (occasionally somewhat mixed-race) living in Western Sahara , and Hassaniya -speaking populations, mainly in Mauritania , Western Sahara , and Northwestern Mali . In 711 the Islamic Arabs and Moors of Berber descent in northern Africa crossed
10070-523: The use of Arabic . In reaction, there was a Morisco uprising in the Alpujarras from 1568 to 1571. In the years from 1609 to 1614, the government expelled Moriscos. The historian Henri Lapeyre estimated that this affected 300,000 out of an estimated total of 8 million inhabitants. Some Muslims converted to Christianity and remained permanently in Iberia. This is indicated by a "high mean proportion of ancestry from North African (10.6%)" that "attests to
10176-603: The western Indian coastal state of Goa —are commonly referred as Moir ( Konkani : मैर ) by Goan Catholics and Hindus . Moir is derived from the Portuguese word mouro ("Moor"). In the late 7th and early 8th centuries CE, the Islamic Umayyad Caliphate , established after the death of Muhammad, underwent a period of rapid growth. In 647 CE, 40,000 Arabs forced the Byzantine governor of northern Africa to submit and pay tribute, but failed to permanently occupy
10282-448: Was also adopted. Initially, the Arabs required only vassalage from the local inhabitants rather than assimilation, a process which took a considerable time. The groups that inhabited the Maghreb following this process became known collectively as Moors. Although a Kharijite rebellion would later push out Umayyad rule from the western Maghreb and form temporarily independent Arab, Berber and Persian dynasties, that effort failed to dislodge
10388-507: Was also used as a nickname; for instance, the Milanese Duke Ludovico Sforza was called Il Moro because of his dark complexion. In Portugal, mouro (feminine, moura ) may refer to supernatural beings known as enchanted moura , where "Moor" implies "alien" and "non-Christian". These beings were siren-like fairies with golden or reddish hair and a fair face. They were believed to have magical properties. From this root,
10494-566: Was constructed to provide a second harbour crossing and to alleviate traffic congestion on the Sydney Harbour Bridge , without spoiling the iconic view. Other reasons for choosing a tunnel instead of a bridge include avoiding difficulties with tides, weather, and shipping during construction (as in the 51.5-kilometre or 32.0-mile Channel Tunnel ), aesthetic reasons (preserving the above-ground view, landscape, and scenery), and also for weight capacity reasons (it may be more feasible to build
10600-467: Was heavier than expected and a pilot engine was provided at the rear. This was detached at the entrance to the tunnel, but halfway through the train came to a halt, and someone had to walk back for the pilot, to the consternation of the passengers. Stephenson had been shown the system by its inventor William Fothergill Cooke supported by Wheatstone of the Wheatstone bridge fame. This was the forerunner of
10706-593: Was much interest in blondes in al-Andalus amongst the rulers and regular Muslims: All the Caliphs of the Banu Marwan (God have mercy on their souls!), and especially the sons of al-Nasir , were without variation or exception disposed by nature to prefer blondes. I have myself seen them, and known others who had seen their forebears, from the days of al-Nasir's reign down to the present day; every one of them has been fair-haired, taking after their mothers, so that this has become
10812-504: Was not until 902 that almost the entire island was in the control of the Aghlabids , from their capital Kairouan ( Tunisia ), with the exception of some minor strongholds in the rugged interior. During that period some parts of southern Italy fell under Muslim control, most notably the port city of Bari , which formed the Emirate of Bari from 847 to 871. In 909, the Aghlabids was replaced by
10918-694: Was of Arab-Berber lineage, managed to evade the Abbasids and flee to the Maghreb and then Iberia, where he founded the Emirate of Córdoba and the Andalusian branch of the Umayyad dynasty. The Moors ruled northern Africa and Al-Andalus for several centuries thereafter. Ibn Hazm , the polymath, mentions that many of the Caliphs in the Umayyad Caliphate and the Caliphate of Córdoba were blond and had light eyes. Ibn Hazm mentions that he preferred blondes, and notes that there
11024-667: Was similar to that of other tunnels designed by the Stephensons for the line, including the south portal of the Milford Tunnel and both portals of the Wingfield Tunnel. Clay Cross railway station was at the northern end, where the line was met by that from the Erewash Valley . The tunnel saw one of the first uses of the absolute block signalling system, maybe after a narrow escape on the south-bound inaugural journey. The train
11130-515: Was split between three Arab emirs, and the Christian population in many parts of the island rose up against the ruling Muslims. One year later, Messina fell, and in 1072 Palermo was taken by the Normans. The loss of the cities, each with a splendid harbor, dealt a severe blow to Muslim power on the island. Eventually all of Sicily was taken. In 1091, Noto in the southern tip of Sicily and the island of Malta,
11236-701: Was superseded by the Madrid M30 ringroad , Spain, and the Chong Ming tunnels in Shanghai , China. All of these machines were built at least partly by Herrenknecht . As of August 2013 , the world's largest TBM was " Big Bertha ", a 17.5-metre (57.5 ft) diameter machine built by Hitachi Zosen Corporation , which dug the Alaskan Way Viaduct replacement tunnel in Seattle, Washington (US). A temporary access shaft
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