上覆土层对可液化场地地震响应的影响研究

为研究上覆土层厚度及土性对地震作用下的可液化场地响应的影响，构造若干类典型可液化场地剖面，将水平成层场地置于基岩上，选取Carbondale波并利用D-mod 2000进行场地非线性动力分析。经计算，随着上覆土层厚度的增加，地表峰值加速度减小；随着上覆土层塑性指数的增大，地表峰值加速度增大；可液化场地对输入地震波具有缩小效应。

Study on Influence of Overburden Soil on Seismic Response of Liquefiable Site

In order to study how the thickness and soil property of overburden affect the response of liquefiable site under seismic action, the profiles of several typical liquefiable sites were constituted with horizontal layered site placed on bedrock, then Carbondale wave was selected and D-mod 2000 was used to conduct the nonlinear dynamic analysis on the sites. Through calculation, it is found that the peak acceleration of the earth surface decreases with the increase of overburden thickness and increases with the increase of overburden plasticity index; liquefiable site is of reduction effect on input seismic wave.