Authors: Er. K. K. Ade, Prof. G. R. Chillal, Dr. B. S. Karkare
Abstract: Underground tunnel construction has been rapidly increasing worldwide. Most of the tunnelling projects are executed in urban areas. The use of tunnelling for utility, such as water supply, sewage disposal and metro rail etc. tunnelling brings a lot of questions with them like managing the site logistics, how to excavate the bores, how to stabilize the soil etc. Due to increase in Industrialization, speed of growth of cities is increasing. This growth resulted in a good future for tackling the problem like water supply, solid waste management, urban infrastructure etc. Traffic and transportation are one of the major issues today. To avoid or to overcome this problem, the underground tunnelling is emerged as a new concept and can help to solve the traffic problem. This thesis emphasizes on the study of underground tunnel (TBM), below the foundations of existing structures. In this study, a 3D finite element analysis is considered to find the optimum distance required for tunnelling in vertical directions. Also a parametric study is conducted with respect to hard murrum and soft murrum for existing foundations like shallow foundation (Isolated foundation) and raft foundation.
Analysis were carried out using MIDAS GTS NX software for 3D tunnelling and the results were cross checked for allowable deflection by passing tunnel through various depth in accordance with the IS 1904-1984. Optimum depth of tunnelling was found out by considering the allowable displacement of existing foundation as per IS Code.
Keywords: Underground Tunnel, TBM, 3D Tunnelling,Tunnels
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