重塑软黏土固结排水三轴试验和本构模型研究

通过室内固结排水三轴剪切试验,分析了重塑饱和软黏土在固结排水条件下三轴剪切过程中的力学特性和变形特征。基于硬化参量与应力路径无关的基本假定,根据曲线积分中的格林公式,构建了新的屈服方程,并建立了一个适合于重塑饱和软黏土的本构模型。采用MATLAB软件编写计算程序,利用新建的重塑软黏土本构模型,对所采用的重塑软黏土和文献报道的Fujinomori黏土的固结排水三轴剪切试验进行理论计算。将试验结果和理论计算结果进行对比,可得出结论:新建的本构模型理论计算结果与重塑饱和软黏土的固结排水三轴试验结果较为吻合,可以较好地描述重塑软黏土在排水条件下的强度与变形特征。

Consolidated drained triaxial tests and constitutive model for reconstituted soft clay

The consolidated drained triaxial tests are carried out to study the mechanical properties and the deformation characteristics of reconstituted saturated soft clay under drained condition. Based on the assumption that the hardening parameter is independent of the stress path, a new yield equation is proposed by adopting the Green’s formula for curve integral. Therefore, a constitutive model is established for the reconstituted saturated soft clay. For the purpose of validation, the programming calculations by MATLAB, which take use of the new constitutive model, are compared to the test results from both the studied reconstituted soft clay and Fujinomori clay, which is reported in the literature. It is shown that the new constitutive model can describe well the strength behaviors and deformation characteristics of reconstituted saturated soft clay under drained condition. And, the theoretical calculations are in good consistence with the test results.