EVALUATION OF LATERAL SUBGRADE REACTION OF PILE DURING SOIL LIQUEFACTION BASED ON LARGE SHAKING TABLE TESTS

Abstract

The lateral subgrade reaction of pile during soil liquefaction is back-calculated based on shaking table tests. It is correlated with relative displacement between soil and pile irrespective of soil density before liquefaction, but with relative velocity for loose sands and with relative displacement for medium to dense sands after liquefaction. The difference in behavior of subgrade reaction between sands with different densities after liquefaction is characterized by the difference in their dilatancy characteristics. The coefficient of subgrade reaction decreases with increasing excess pore pressure and relative displacement, and this trend becomes pronounced with decreasing initial confining pressure and soil density.