基于统计损伤本构模型的改进接触面模型研究
Research on improved contact surface constitutive model based on statistical damage constitutive model

考虑桩土界面初始剪切刚度的深度效应,把接触面剪切应力和剪切应变沿接触面厚度均匀化,提出基于统计损伤本构模型的无厚度单元接触面本构模型,根据剪切实验的数据对改进的本构模型参数进行拟合,得到了不同法向应力下的模拟曲线。计算结果表明:本文提出的无厚度单元接触面本构模型是正确的,能够合理地模拟桩土界面的力学行为,可以描述接触面剪切刚度的非线性变化,适用性强,有较高的理论和实际应用价值。
Considering the initial shear stiffness depth effect of the pile-soil interface and keeping the uniformity along the contact surface thickness direction of the shear stress and shear strain, the paper put forward the zero-thickness zone contact surface constitutive model based on the statistical damage constitutive model. According to the shear experiment data , we obtained the simulation curves fitting parameters of the improved constitutive model under different normal stresses .Calculation results indicated that the zero-thickness zone contact surface constitutive model developed was correct ,which could simulate reasonably the mechanical behavior of the pile-soil interface and describe the nonlinearity of the pile -soil contact surface shear stiffness. It also has strong applicability, relatively high theoretical and practical application value