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  Tunnelling and Underground Metro Stations in the Ground Condition of Kathmandu Valley, Nepal

  This paper presents a proposal of an underground metro rail network for the densely populated central part of the Kathmandu valley. Four underground metro rail routes and nine major underground stations are proposed for the urban core area to facilitate the urban mobility. The ground conditions within the valley are complex due to the nature of its lacustrine depositions, with water-bearing soft clay and sands. Nevertheless, this paper demonstrates the feasibility of metro construction in these ground conditions and investigates the appropriate sizes, depths, methods of construction and construction cost of the relevant underground assets such as tunnels, cross-passages and station boxes.

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