Probabilistic and deterministic based approach for Liquefaction potential assessment of layered soil

Abstract

The assessment of liquefaction potential in the present study is based on deterministic and probabilistic approach. The deterministic approach was used to analyze the liquefaction assessment of loose saturated river bed deposit with emphasis to two benchmark location. A wide range earthquake data in form of PGA’s value of 0.18g, 0.37g, 0.6g, 0.75g is used as input motion. The dynamic properties of soil were evaluated by using SPT data obtained from the bore log locations. The shear stress induced within soil deposit due to the seismic excitation in the form of cyclic stress ratio (CSR) and cyclic resistance ratio (CRR) was calculated in order to calculate the factor of safety (FOS) against liquefaction. In addition to that, liquefaction potential index (LPI) and probability of liquefaction was also calculated using input motion. It was observed that the shallow layer soil profile is safe against liquefaction whereas deep layer soil profile is unsafe based on probability of liquefaction index.