Proceedings of DFI-India 2018: 8th Conference on Deep Foundation Technologies for Infrastructure Development in India, (DFI)
Effect of Geotechnical Parameters in Design and Construction of Metro Tunnel below River Ganges in Kolkata, India
Biswanath Dewanjee, Chief Engineer
The Ganges is one of the most prominent rivers in India and historically major cities like Kolkata are developed along the banks. There was a rapid upsurge in population in the Kolkata metropolitan area during the last 50 years and consequently it is necessary to develop a modern mass transportation facility in this region. Kolkata East-West Metro is a crucial mass transit corridor project connecting Kolkata and its twin city Howrah on other side of river. Twin bored tunnels were built below the river Ganges to connect the cities. The tunnel is 16m to 19m below the river bed. The 5.55 meter (m) internal diameter tunnels are constructed with concrete RCC segmental liners. The 520 m river crossing was accomplished using earth pressure balancing tunnel boring machines (TBM). This is the first transportation tunnel project in India under such a large and revered river. This ambitious initiative involved meticulous planning and investigation of the Ganga- Brahmaputra ?ic region juvenile alluvial sub-soil. This paper covers geotechnical investigation, hydrological data collection, selection criteria for alignment design, type of construction, and selection of the tunnel boring machine.
|article #3160; publication #1050 (India2018)|