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在已有工作基础上建立了水力-力学耦合的非饱和土本构模型,在硬化方程中考虑饱和度的影响,同时在土水特征曲线中考虑了塑性体变的影响,从而使模型可以反映非饱和土中的毛细现象与土中弹塑性变形现象的耦合行为。采用隐式积分方法,建立了非饱和土耦合模型的数值模型,并推导了得到了水力-力学耦合的非饱和土的一致切线模量。利用该算法编制了本构模型计算的子程序,使其能向外输出切线刚度矩阵,用于有限元计算。为了验证该算法和程序的正确性,用所编制程序对不同路径下的土体行为进行了预测。通过预测结果与试验结果相对比,表明程序预测结果与试验数据相吻合,模型可以较好地模拟土体的水力-力学耦合行为特性。
Based on the existing work, a hydraulic-mechanics-coupled unsaturated soil constitutive model was established, and the influence of the saturation was considered in the hardening equation. Meanwhile, the plastic deformation was taken into account in the soil-water characteristic curve so that the model could reflect Coupling Behavior of Capillary Phenomena and Soil Elastoplastic Deformation in Unsaturated Soil. The implicit integration method is used to establish the numerical model of the unsaturated soil coupling model and deduces the consistent tangent modulus of the unsaturated soil with the coupling of hydraulic and mechanical. Using this algorithm, the subroutine of constitutive model calculation is compiled, which can output the tangent stiffness matrix to the finite element calculation. In order to verify the correctness of the algorithm and the program, the programmed procedure was used to predict the behavior of soil under different paths. The prediction results are in good agreement with the experimental ones. The results show that the predicted results are in good agreement with the experimental data. The model can simulate the hydraulic-mechanical coupling behavior of the soil well.