倾斜土层地震液化诱发大变形数值分析方法

A method for numerical analysis of seismic liquefaction induced large deformation of sloping soil layer

基于有限元理论,进行了缓坡土层地震液化引起大变形的数值方法研究,即采用二维有效应力动力有限元方法进行分析,在液化分析过程的每一时段考虑地震液化和振动软化得到土单元的模量,通过非线性静力方法计算每时段地震液化引起的大变形,得到土层各深度处的水平和竖向位移。由算例分析了地震动和土层坡度等因素的影响,通过对比分析表明了该方法的有效性,可为工程场地地震地质灾害评价提供参考数据。

Sloping soil layer will be liquefied and yield large deformation under earthquake vibration.Based on finite element theory, a numerical method is studied for seismic liquefaction induced large deformation of gentle inclined soil layer.In this method, Liquefaction analysis is performed by two-dimensional dynamic effective stress finite element method,and in each time segment of the analysis,modulus of soil elements are achieved considering soil liquefaction and vibrated soften;then large deformation of soil layer is calculated by nonlinear static method in the end of each time segment,horizontal and vertical displacements are acquired in any depth of soil layer at last.By examples,the influences on large deformation are studied with different earthquake accelerations and slope angle.Compared with the results of other researches,the validity of the new method is confirmed;and it is applicable to solutions of earthquake geological hazards evaluating in engineering field.