Experimental study of liquefaction strength affected by residual excess pore water pressure induced by earthquake

Abstract

Under the actual condition of frequent earthquakes in a short time, there will be different dissipation conditions of excess pore water pressure in sand after earthquakes. Considering the different time intervals between earthquakes in a short time, this paper studies the liquefaction strength of sand under residual excess pore water pressure after earthquakes. In this paper, dynamic triaxial tests are carried out for saturated sand, and the effect of residual excess pore water pressure on liquefaction strength of sand is investigated by using the "seismic loading-interval-seismic loading" cyclic loading model. The test results show that the liquefaction strength of sand decreases, even though the sand become denser due to re-consolidation after liquefaction. Liquefaction history is the dominant factor affecting liquefaction strength of sand compared with residual excess pore water pressure induced by earthquake.