Abstract
The Rohtang tunnel is about 8.8 km long and is one of the important road tunnels in the Himalayas which facilitates all round connectivity between Manali (in the south) and Keylong (in the north), with its Lahul & Spiti district headquarter. This tunnel lies in complex geology with many folds and faults intersecting it at various locations. Three major rock types include uniformly dipping sequences of phyllites, schists and gneissose rocks with a minimum overburden of about 600 m and a maximum of 1900 m. The geological complexity of area further increases due to anatexis and migmatization of rocks. In order to assess the tunnel stresses and displacement, a closed-form solution is used. The obtained results are validated using finite element analysis. The role of complex geology and high & varying overburden is considered for suitable designing of tunnel support system.
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Singh, L.M., Singh, T., Rao, K.S. (2019). Ground Response and Support Measures for Rohtang Tunnel in the Himalayas. In: Badr, M., Lotfy, A. (eds) Sustainable Tunneling and Underground Use. GeoMEast 2018. Sustainable Civil Infrastructures. Springer, Cham. https://doi.org/10.1007/978-3-030-01884-9_9
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