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Site response and liquefaction susceptibility estimation of a site in northern part of Bangladesh

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Abstract

This study has made the site response and liquefaction analysis of a solar power plant site in the northern part of Bangladesh. The site is situated in an area that is near to Himalayan thrust and home to numerous large earthquakes including the 1885 Bengal, the 1897 Great Indian, the 1930 Dhubri, the 1934 Bihar–Nepal, the 2011 Sikkim, and many other relatively smaller earthquakes. Because of the past seismicity and significance of the power plant site, seismic investigation has been performed in the seismic control region within a radius of 300 km from the center of the plant site. The peak ground acceleration (PGA) value at the bedrock level for a return period of 475 years for the site has been estimated to be 0.23 g. For the last few decades, the site coefficients are generally estimated from the mean shear wave velocity for the top 30 m of a location. The surface PGA of a location is equal to the product of the bedrock PGA and the estimated site coefficient. If the bedrock is located at a depth greater than 30 m below the ground, the site effect estimated from Vs30 cannot appropriately represent the site coefficient. For the study site, the bedrock is approximately 150 m below the ground. For loose sedimentary deposits of this site, the site coefficient based on Vs30 to assess the PGA on the surface is not suitable. In this research, site amplification factor based on Vs30, equivalent-linear, and nonlinear methods has been carried out to estimate the PGA at the surface of the site. In this site, the susceptibility of liquefaction has been estimated by utilizing 66 boreholes having SPT-N values at every 1.5 m distance from the surface to a depth of 20 m. Here liquefaction susceptibility has been assessed by applying Seed and Idriss’ simplified method, the Japanese method, and the Chinese method. The estimated LPI contours show that the soil up to a depth of 20 m for almost all the boreholes is highly susceptible to liquefaction.

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Correspondence to Mehedi A. Ansary.

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Ansary, M.A., Jahan, N. Site response and liquefaction susceptibility estimation of a site in northern part of Bangladesh. Environ Earth Sci 80, 781 (2021). https://doi.org/10.1007/s12665-021-10079-w

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  • DOI: https://doi.org/10.1007/s12665-021-10079-w

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