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等幅循环加卸载条件下,经典弹-塑性模型无法描述再加载过程中土体的塑性变形。统一硬化模型参数与Cam-clay模型完全相同,不仅能够描述土的剪缩、剪胀、硬化、软化和应力路径依赖性等特性,而且能够描述循环加载条件下再加载过程中土体发生的塑性变形。通过将UH模型推广应用到复杂加载情况,并进行循环荷载作用下地基承载力有限元的模拟。分析采用Cam-clay模型以及UH模型计算所得的地基的p-s曲线的特点,分析不同深度结点以及横向结点的应力-应变特性。分析表明,UH模型能合理反映复杂加载条件下土的变形特性,有非常好的应用前景。
Under the condition of equal loading and unloading, the classical elastic-plastic model can not describe the plastic deformation of soil during reloading. The uniform hardening model has the same parameters as the Cam-clay model, which not only can describe the soil shear-shrinkage, dilatancy, hardening, softening and stress path dependence, but also describe the plasticity of the soil during reloading under cyclic loading Deformation. The UH model is popularized and applied to the complicated loading condition, and the finite element simulation of the bearing capacity of the foundation under cyclic loading is carried out. The characteristics of the p-s curve of the foundation calculated by the Cam-clay model and the UH model are analyzed, and the stress-strain characteristics at different depth nodes and lateral nodes are analyzed. The analysis shows that the UH model can reasonably reflect the deformation characteristics of soils under complex loading conditions and has very good application prospects.