Liquefaction Potential
of Sites in Kalyani Region based on Shear Wave Velocity Data
Kumar Sajjan, Muley Pradeep and Syed N.M.
Disaster Advances; Vol. 15(6); 33-43;
doi: https://doi.org/10.25303/1506da033043; (2022)
Abstract
Liquefaction hazard is one of the most catastrophic effects of an earthquake. When
dynamic loading occurs, saturated sandy soil in undrained conditions loses its shear
strength due to the development of excess pore water pressure. Therefore, it is
imperative to evaluate a site for its susceptibility to liquefaction. The main objective
of the present study is to calculate the liquefaction potential of 6 sites in Kalyani
region which are located at around 50 km from the City of Kolkata in the State of
West Bengal, India. For this purpose, six bore locations are selected in the All
India Institute of Medical Sciences, Kalyani, Kolkata Campus.
The liquefaction potential of the site is calculated at all the six locations for
an earthquake of magnitude 7.5 and peak ground acceleration (PGA) of 0.16 g. The
water table is considered at the ground level. Liquefaction potential in terms of
Factor of Safety against liquefaction is calculated with the depth based on the
shear wave velocity data. Further, liquefaction potential index is also evaluated
for all the considered sites. It is observed that the possibility of liquefaction
is very high at shallow depths. Moreover, a parametric study is carried out for
various values of the magnitudes of earthquakes and PGA values to show its effects
on liquefaction susceptibility.
