【摘要】 受动应力加载复杂性和自身物性参量非确定性的制约,定量描述土体动残余变形过程的细节特征难度较大。以动应力加载效应的拟静力化处理为基础,考虑摩尔-库伦破坏准则,建立能够综合反映土体动力耐受特性的应力比。以黄土为例的试验分析结果表明,动应力加载效应的处理方式能够有效简约土体动残余变形的复杂性;应力比与动残余应变之间的定量关系,可清晰反映黄土具有的起始动应力阶段、非线性动力变形阶段和孔隙压缩极限阶段的细节特征;基于抗剪强度的动残余变形分析,能够实现任意黄土动残余变形的综合对比。更多还原

【Abstract】 It is difficult to describe detailed features of dynamic residual deformation of soil because the residual deformation is influenced by both of complicacy of loading process and uncertainty of physical properties of soil.Based on the pseudo-static concept of loading effect of dynamic stress,we applied Mohr-Coulomb failure criterion to propose the stress ratio,which figures the dynamic tolerability of soil. The laboratory cases of loess dynamic residual deformation shows the loading effect of dynamic stress could decrease the complicacy of dynamic residual deformation. The relationship of stress ratio and dynamic residual strain can disclose the detailed features of three different stages within loess dynamic residual deformation process,i. e. the first one before initial dynamic stress,the second one of nonlinear dynamic deformation,and the last one after void compression limit. Furthermore,the shearstrength-based analysis method could contrast one of loess residual strain with any others under dynamic loadings.更多还原