What is a borehole? , A kind of tunnel, A smaller version of the final tunnel, A shaft drilled into the ground, A tunnel construction method, Match the type of tunnel to its use. >> Cut and Cover <<, Tunnels close to the surface, Underwater tunnels, Tunnels under towns, Match the type of tunnel to its use. >> Immersed Tube <<, Tunnels close to the surface, Underwater tunnels, Tunnels under towns, Match the type of tunnel to its use. >> Bored tunnel <<, Tunnels close to the surface, Underwater tunnels, Tunnels under towns, What tunnelling system was used to create the tunnels in the London underground system? , Cut and Cover, Boring, Top Down, Immersed , What will the choice of boring machine depend on? , A The number of buildings and roads in the area, The depth and length of the tunnel, The rock type and ground water content, The time available to complete the project, What is the purpose of ground freezing? , It increases the stand-up time, It allows tunnels to be built in hard rock, It allows water to be pumped out of the ground, It softens the rock, Which of these tunnel shapes is MOST difficult to support? , , , , .
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