Design of a railway tunnel parallel to an existing tunnel

摘要

Mumbai Rail Vikas Corporation Limited has planned to construct 5th and 6th railway lines from Thane to Diva. On the route, the rail line passes through various geological features like creeks, lineament, hills and flood creek plains. Because of the varied topography, various structures like bridges, foot over bridges and tunnels are to be constructed. Grayish to brownish fine grained amygdaloidal basalts are present in the area. The proposed new tunnel having length 150 m, width 12m and height 8.5m is to be driven parallel to the existing tunnel. The tunnel is to accommodate two broad gauge rail tracks. There is also a provision of one trolley refuse in the tunnel. The empirical and the numerical approach used for the analyses and design of the tunnel have been discussed in the paper.