【摘要】 从土体地震液化机制出发,将土体液化大变形的物理机制总结为循环剪切下剪胀与剪缩交替作用产生的累积变形和孔压上升、强度衰减后的流动变形2种类型,对液化大变形的2种物理机制解释分别进行了论述;概括了当前土体液化大变形预测和分析方法,对研究进展进行了评述;最后,指出了土体地震液化大变形研究中存在的分歧和争议,针对液化大变形机制提出了孔压梯度驱动土体液化流动大变形的假设,并对几种典型的液化大变形现象进行了解释和讨论。更多还原

【Abstract】 According to the liquefaction mechanism of soil,the mechanism of liquefaction-induced large deformation was divided into two types:the accumulated deformation caused by dilatation action of soil under cycle loading,and the flow deformation caused by the rise of pore water pressure and the decay of soil strength.The physical mechanism of the two types was discussed.The precast and analytic methods of liquefaction-induced large deformation of soil were summarized,and the research advance was commented.Finally,differences and disputes on the study of liquefaction-induced large deformation of soil were pointed out.A hypothesis showed that the pore water pressures gradient existed in soil during liquefaction promoted the soil flow,and several typical phenomena of liquefaction-induced large deformation of soil were explained.更多还原