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在临界状态理论的基础上,通过引入状态参数来调整硬化参数和剪胀方程,从而更好地反映砂土的剪胀、剪缩特性以及砂土对密度、有效主应力的双重依赖性,通过引入修正屈服函数的参数,能更好地描述砂土的塑性变形特性。同时,模型采用砂土等向固结线和临界状态线在孔隙比与有效应力幂函数平面内呈线性关系,并且只用一组材料参数即可描述在较大密度和较大有效应力范围内砂土的应力应变响应。通过模拟结果与试验结果对比,验证了模型的有效性。
Based on the critical state theory, the hardening parameters and dilatancy equations are adjusted by introducing state parameters to better reflect the dilatancy and shear-shrinkage characteristics of sand and the dual dependence of sand on density and effective principal stress. The introduction of parameters to correct the yield function can better describe the plastic deformation characteristics of sand. At the same time, the model uses the sand-soil equalization line and the critical state line to have a linear relationship between the void ratio and the effective stress power function plane, and only one set of material parameters can be described in the range of larger density and larger effective stress Sand and soil stress and strain response. By comparing the simulation results with the experimental results, the validity of the model is verified.