Abstract
Seismic behaviour of soils is primarily governed by dynamic properties under cyclic loads. In this paper, this has been investigated for NW Himalayan region. The study focuses primarily on two sites: Dhanauri and Roshnabad, both located in the Ganga foreland basin. The Dhanauri site comprises distinct layers of clay, silt, and sand, and the Roshnabad site comprises predominantly gravelly soil. The soil samples were collected from two sites from different depths using SPT. The MASW tests have been also conducted on these sites. The strength characteristics of soil samples collected from Dhanauri and Roshnabad were investigated by a series of cyclic triaxial tests. Strain controlled undrained cyclic triaxial tests were performed to evaluate dynamic properties of the soil. The effect of shear strain on shear modulus reduction and damping has been investigated. It was observed that the variation in shear modulus ratio with shear strain is large for the samples collected at higher depth. Moreover, at high shear strains, the difference in shear modulus ratios decreases with depth.
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