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针对饱和黏土的循环弱化特性,在商用有限元软件的基础上,建立了基于非线性运动硬化准则的饱和黏土循环弱化模型,在各向同性的硬化准则中引入了以等效塑性变形为变量的弱化规律,采用非线性运动硬化准则描述土体的循环滞回特性,同时考虑土体刚度的弱化。通过与饱和黏土单向循环三轴试验结果对比,验证了该模型的有效性。应用本模型,对竖向循环荷载作用下的单桩进行了二维有限元数值模拟,研究了不同循环荷载水平、不同循环次数、在不同土体刚度指数的地基中单桩竖向承载力的弱化情况。最后通过对有关文献模型试验的模拟对比验证了该数值方法的有效性。
Based on the commercial finite element software, a cyclic weakening model of saturated clay based on the nonlinear kinematic hardening criterion is established for cyclic weakening of saturated clay. Equivalent plastic deformation is introduced into the isotropic hardening criterion Weakened law, the nonlinear kinematic hardening criterion is used to describe the cyclic hysteretic behavior of soils, and the weakened stiffness of soils is taken into account. The effectiveness of this model is verified by comparing with the one-way cyclic triaxial test of saturated clay. By using this model, two-dimensional finite element numerical simulation of single pile subjected to vertical cyclic loading is carried out. The vertical bearing capacity of single pile under different cyclic load, different cyclic number and different soil stiffness index Weakening situation. Finally, the validity of the numerical method is verified through the simulation comparison of the related literature model tests.