Shaking table testing on seismic liquefaction of soft soil under building footing

The liquefaction phenomena of sandy powder soil under building footing are reproduced with shaking table tests on dynamic soil_structure interaction. Based on these tests, the issues of the development of excess pore water pressure in soft soil under simulated earthquake excitations are investigated. Excess pore water pressure in soil increases with the increasing of excitations. And variation of excess pore water pressure is related to the situation of measuring point, soil characteristics, the spectral characteristics of seismic excitation, and so on. Excess pore water pressure does not always dissipate in short time immediately after the excitations, but it may keep on increasing too.