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Tunnel Construction. 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 ground water conditions, the length and diameter of the tunnel drive, the depth of the tunnel, the logistics of supporting the tunnel excavation, the final use and shape of the tunnel and appropriate risk management.
Cut-and-cover construction at Saint-Michel on Paris Métro Line 4 (c. 1910) 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. [29] There are two basic forms of cut-and-cover ...
Deep level underground is construction that is 20 m (66 ft) or more below ground and not using the cut-and-cover method, especially train stations, air raid shelters and bunkers, and some tunnels and mines. Cut-and-cover is a simple method of construction for shallow tunnels where a trench is excavated and roofed over with an overhead support ...
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Tunnel construction is a sub-discipline of civil engineering [3] and usually the domain of engineers and construction companies. When civilians dig tunnels, it may be for criminal purposes (like smuggling or hiding illegal goods), [2] or gaining unauthorised access to an area. People may also build escape tunnels, such as those under the Berlin ...
Underground construction has a number of unique risks and challenges but shares a lot with traditional construction and mining. Underground construction workers often work under reduced light condition, in dangerous spaces, and are at a high risk of exposure to contaminants, fire, and explosions.
In 1995 it was proposed to build a tunnel for the A303 underneath the World Heritage Site. A conference agreed on a 2.5-mile (4 km) bored tunnel; however, the government instead proposed a cut and cover tunnel, with plans being published in 1999.
Each completed tunnel is 8,500 feet (2,600 m) long and 20 feet (6.1 m) in diameter, supported by 1,750 concrete rings placed during the boring operation. [37] Two of the three underground stations were constructed using cut-and-cover methods while Chinatown station was constructed with the sequential excavation method. [38] [39]
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