Evaluation of in-situ saturation state of soils and its effect on earthquake ground response

摘要

Downhole array acceleration records obtained at a reclaimed site show that the degree of saturation of soils has a significant influence on seismic vertical amplification. In this paper, the evaluation of in-situ saturation state of soils and its effect on vertical amplification are studied. The characteristics of P-wave velocity, Psisson's ratio and degree of saturation of soil deposits are analyzed, which are shown to be helpful in identifying the in-situ saturation state of soils. A coupled FE analysis of the response of the array site is performed by including the effect of degree of saturation. Numerical results demonstrate the significance of the degree of saturation in simulation of vertical ground amplification.