考虑土渐近状态特性的应力应变关系

在经典弹塑性理论框架下,根据SMP(Spatially Mobilized Plane)破坏准则并结合变换应力方法,通过引入准弹性体积模量的概念,建立了用增量法表示的考虑土渐近状态特性的三维应力应变关系式.针对三轴压缩应力条件,给出了相应的简化应力应变增量矩阵,以三轴压缩试验中的常规三轴压缩、不排水剪切和控制应变增量比的3种应力路径为例,推导出了便于应用的应力应变增量关系式.最后,利用文中的公式进行了预测分析和试验对比,结果表明:新推导的公式能方便地预测考虑渐近状态特性下土的应力应变关系,并能合理描述试验结果.

Stress-strain incremental law in asymptotic state for soils

Based on the classical elasto-plastic theory,the transformed stress space deduced from the spatially mobilized plane(SMP) criterion and a new concept of similar elastic volume modulus,the stress-strain incremental equations of soils for the asymptotic state constitutive model were established.A simple stress-strain incremental matrix under triaxial compression condition was formulated,in which the modified Cam-clay model was a special case.The stress-strain incremental equations were then proposed to simula...