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  Concept Design of Sadar Bazar Underg round MRTS Station in Congested Area, Delhi

  Delhi Metro is a Mass Rapid Transit System of the capital of India and one of the busiest metro lines in the world. Sadar Bazar station is one underground station proposed in Phase IV located in a very congested marketplace, with buildings constructed more than 100years ago. The geotechnical profile consists of sandy silt upto 5m depth followed by weathered rock underneath. The station was initially planned to be built by NATM in rock to accommodate station in congested region (width < 20m). Due to the complicated construction methodology, probability of higher seepage and high building settlement, this option was eliminated. Alternatively, the station was planned with two tunnels (UP & Down) stacked at staggered manner to reduce station width. In this option, commuters’ travel length has been increased between several levels. Finally, to provide better mobility and service to commuters, both Up and Down line tunnel have been proposed one above another, with clear gap of less than 1-diameter of tunnel, which is challenging for design & execution of tunnel including challenges of providing cross passage at same level. This proposal is an innovative design to be constructed in India to achieve lower construction risk with comfortable passenger movement.

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