【摘要】 根据上海市区典型土层的力学参数,构造不同地层组合的计算剖面,利用Biot固结理论和亚塑性边界面模型的排水有效应力动力分析法,研究地层结构对砂土液化的影响。分析发现:上履土层厚度增加时,砂土峰值孔压比随之减小;上履土层较软时,砂土峰值剪应力先增加、后减小;较硬时,峰值剪应力单调增加。下卧土层越厚,砂土层的峰值孔压比越小,峰值剪应力愈大,总体变化都不大,但下卧土层较软时,砂土层的峰值孔压比变化相对明显。更多还原

【Abstract】 Based on the meachnical behaviors of representative soil layer in Shanghai,several computation profiles with different soil layer constructions are built.An effective-stress procedure,in which the bounding surface hypoplasticity model and Biot consolidation formulation are coupled,is used to analyze the effect of soil layer constructions on liquefaction of sandy soil.The results show: the thickness of covering soil layer increases,peak pore pressure ratio of sandy soil decreases;when it is softer,shear stress of sandy soil increases firstly,then decreases;but harder,it increases continuously.The deeper underlying soil layer is,the smaller peak pore pressure ratio and the more shear stress of sandy soil is;both are not obvious.But,if softer,the peak pore pressure ratio of sandy soil changes more sharply.更多还原