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The Two Long and Deep Base Tunnels of the Swiss AlpTransit: Gotthard and Lötschberg The heart of the planned new North-South rapid railway connection through the Swiss Alps is the 57 km long Gotthard Tunnel and the 42 km long Lötschberg Tunnel. The overburden exceeds 2200 m in both tunnels which leads to a number of specific problems concerning geological predictions, tunnel design and methods of excavation to be applied. After a concise description of the main features of the recently completed preliminary design including tunnel cross-sections, number of tubes, location of intermediary attacks and the associated logistics, a few crucial questions and the proposed solutions will be dealt with in more detail. A specific problem arises from tunneling through critical geological formations at great depth under extremely high water pressure.
Index Terms:rock; TunnelingGroup
Further Information:Date published: 1995