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在临界状态理论的基础上,通过引入修正屈服函数的结构性参数,可更好地描述松砂的塑性变形特性。通过引入状态参数来调整硬化参数和剪胀方程,从而更好地反映松砂的剪缩特性和对密度、有效主应力的双重依赖性。同时,模型采用砂土等压固结线和临界状态线在有效应力幂函数平面内呈线性关系的特性,更准确地反映了砂土的应力-应变特性。通过数值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 plastic deformation characteristics of loose sand can be better described by introducing the structural parameters that correct the yield function. Through the introduction of state parameters to adjust the hardening parameters and dilatancy equations, so as to better reflect the shear-shrinkage characteristics of the loose sand and the density and effective principal stress of the dual dependence. At the same time, the model is characterized by a linear relationship between isobaric consolidation line and critical state line in the effective stress power function plane, which can more accurately reflect the stress-strain characteristics of sand. The effectiveness of the model is verified by numerical simulation and experimental results.