【摘要】 以变形作为地震工程安全设计的控制标准是近年来逐渐发展的趋势.堤防工程在液化地基中的地震残余变形的分析是较复杂的问题.采用定义在应变空间中考虑土体动主应力轴方向偏转影响的多重剪切机构塑性模型的动力有效应力分析方法分析某场地堤防的地震液化变形,分析了堤防在7度设防地震下的地震变形时程变化特征、残余变形分布、超静孔隙水压力的分布情况以及时程变化特征.分析结果表明,砂土层中的孔隙水压力水平发展较高,整个场地的回填砂大部分发生了液化,土体产生了较大的变形,最大变形主要集中在地表层,路堤场地的地震残余变形相对较大,原因在于地震过程中建立堤防的场地具有初始剪应力驱使土体发生较大的残余变形.更多还原

【Abstract】 The deformation control criterion in seismic engineering design is a new tendency in recent years,and the study of the seismic residual deformation of dike engineering is a complex problem in liquefied foundation.The effective stress method is used,in which nonlinear constitutive model of a multiple shear mechanism type is defined in strain space and the rotation effect of principal stress axis direction is covered.Considering time characters,distributions of seismic residual deformation of the dike in Singapore and distribution of excess pore pressure in foundation,a series of results are analyzed under 7 seismic intensity.The results show that the development of excess pore pressure is high and a great of shallow foundations are liquefied.Great deformation of dike is distributed in shallow foundation,and it is induced by initial shear stress due to the existence of dike.更多还原