过去对地震引起粉土液化方面的研究还不完善,本文通过利用有限差分软件FLAC3D,解决了如何分析初始静力平衡、设置边界条件和动力响应等问题,并对地震荷载下的粉土路基进行了详细的动力分析。最终得到不同烈度的地震荷载下的超静孔隙水压力、有效应力和超孔压比时程曲线,由此判断可能造成的粉土最大液化深度。该方法为利用FLAC3D求解粉土液化深度问题提供了范例。 In the past, the research on the liquefaction of silt caused by earthquake was not perfect. In this paper, by using finite difference software FLAC3D, the problems of how to analyze the initial static balance, set the boundary conditions and dynamic response are solved, and the silt subgrade under earthquake load A detailed dynamic analysis. Finally, the ultra-static pore-water pressure, effective stress and excess pore pressure ratio time-course curves under different seismic loads are obtained to determine the maximum possible liquefaction depth of silt. The method provides an example for solving the problem of liquefaction depth with FLAC3D.