Abstract
To 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.
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Acknowledgements
This work was carried out as part of undergraduate thesis work by the second and third authors at the civil engineering department, BUET. PLAXIS-2D computations were performed at the computational laboratory of BUET-Japan Institute of Disaster Prevention and Urban Safety. PLAXIS-2D was procured under a research development fund (HEQEP CP-3140) from the University Grants Commission of Bangladesh.
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Al-Hussaini, T.M., Barua, S., Ahmed, M. (2022). Seismic Response Perspective for the Proposed Subway Tunnel Near Kamalapur Railway Station. In: Sitharam, T.G., Kolathayar, S., Jakka, R. (eds) Earthquakes and Structures. Lecture Notes in Civil Engineering, vol 188. Springer, Singapore. https://doi.org/10.1007/978-981-16-5673-6_19
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DOI: https://doi.org/10.1007/978-981-16-5673-6_19
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