Abstract
AbstractTo mitigate ever-growing traffic congestion in Dhaka city, the Government of Bangladesh is implementing the Mass Rapid Transit (MRT) project. The MRT Project consists of several metro rail routes in the city, some of these routes are elevated rail, while some are planned to be partly elevated and partly underground. Construction of MRT Line 6 consisting of elevated rail is in progress, while the second route (MRT Line 1) being planned for construction consists of some underground portions. Bangladesh, located near the plate boundaries of the Indian Plate colliding with the Eurasian Plate, possesses significant seismic hazard. According to the latest updated version of the Bangladesh National Building Code (BNBC-2020), Dhaka city has a seismic zone coefficient of 0.20 (maximum considered earthquake) for rock sites. For local soil conditions, ground motions may exceed 0.25 g. This paper considers a site near Kamalapur Railway station, the Railway Hub in Dhaka city, where MRT Line 1 will end. The seismic response of a typical cross-section of subway tunnel is analyzed using the finite element software PLAXIS 2D. Time history analysis under 2D plane strain conditions is conducted for various intensity levels of earthquake motion incorporating site effects.KeywordsSubway tunnelSeismic responseSite amplificationDhaka MRTFEM
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