一、引言近几年来,关于砂土液化的理论研究和试验技术已经得到了很大的发展,砂土液化的动力分析方法也从习用的总应力法逐渐发展为有效应力法。在分析中不仅考虑到地震剪应力作用下土体内孔隙水压力的产生,而且还考虑到孔隙水压力的扩散和消散,从一 I. INTRODUCTION In recent years, the theoretical research and experimental techniques for sand liquefaction have been greatly developed. The dynamic analysis method for sand liquefaction has also evolved from the conventional total stress method to the effective stress method. The analysis not only considers the generation of pore water pressure in the soil under the action of seismic shear stress, but also considers the diffusion and dissipation of pore water pressure from a