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采用饱和土层和半空间精确的动力刚度矩阵,建立了求解P波、SV波斜入射情况下水平层状饱和场地地震响应的一维等效线性化分析方法。将饱和场地退化至干土场地进行方法验证,并将该文结果与二维有限元程序FLUSH结果进行对比,验证了该文方法的准确性。以天津市区某典型饱和场地为例,分别比较了P波和SV波入射情况下饱和场地线性、非线性地震响应之间的差别,以及饱和场地、干土场地非线性地震响应之间的差别,并讨论了入射角度和透水条件等因素对地面运动加速度峰值的影响,总结了饱和场地非线性地震响应的一些基本规律。
Using the accurate dynamic stiffness matrix in saturated soil and semi-space, a one-dimensional equivalent linearization analysis method for the seismic response of horizontal layered saturated ground under P-wave and SV-wave oblique incidences is established. The method is validated by comparing the two-dimensional finite element program FLUSH with the method of verifying the accuracy of the method. Taking a typical saturated area in Tianjin as an example, the differences between linear and nonlinear seismic responses of saturated ground and the nonlinear seismic responses of saturated ground and dry ground are compared respectively when P and SV waves are incident The effects of incident angle and water permeability on the acceleration of ground motion are discussed. Some basic laws of nonlinear seismic response in saturated ground are summarized.