Effect of Liquefaction on Behavior of Strip Footings on Sands in Roorkee

Abstract

Many strong earthquakes have shown the risk of constructing strip footings in areas where earthquake induced liquefaction is occurred. Liquefaction analysis of strip footings mainly depends on excess pore pressure, degraded bearing capacity, and liquefaction induced settlement. This paper corresponds to liquefaction performance of strip footings. Analytically studies are carried for determining the effect of liquefaction on strip footings resting on sand. The evaluation of liquefaction potential was determined using standard penetration data of sand layers. Parametric studied have also been performed by varying relative density of soil, peak ground acceleration, and location of liquefiable layer below the footing. It can be found that the liquefaction induced settlement is directly related to Peak Ground Acceleration. Bearing capacity is not greatly influenced by PGA because it is directly related to excess pore pressure. The location of liquefiable layer below the footing affects the liquefaction performance; if depth below increases, then there is decrease in dynamic settlement and increase in bearing capacity.