Liquefaction Susceptibility of Soils in Himalayan Region

Abstract eng:
Aim of this paper is to analyze the liquefaction susceptibility of some selected sites. The selected sites are near Dehradun, capital city of northern state of Uttarakhand, India. Site specific data related to Standard Penetration Tests and Shear Wave Velocity are collected for determination of liquefaction susceptibility of these sites using field-based procedures. In these procedures, shear stresses due to earthquake are evaluated using actual ground response analysis (where shear wave velocity is a key factor) and liquefaction resistance of soil is determined based on the N values. Liquefaction susceptibility is also evaluated using laboratory tests. This includes tests on a small shake table where frequency and amplitude of harmonic excitation can be controlled. Number of cycles and pore water pressure at liquefaction is measured. The effect of non-plastic fines on liquefaction potential is evaluated. A comparison of results obtained from in situ tests and laboratory tests has been carried out. It has been found that few sites are very much susceptible to liquefaction.

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