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中文摘要：
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。
英文摘要：
Based on the unified hardening parameter,an extended critical state constitutive model for sand is proposed.One state parameter is used to adjust the hardening parameter and dilatancy equation,giving a better description of dilatancy and contraction behavior for sand.The other parameter is used to revise the yield function,predicting the plastic deformation more appropriately.The introduction of the parameters into the model emphasizes the dependency on both the density and the effective principal stress of sand.The linear isotropic consolidation and the critical state lines are applied in void ratio versus the power of the effective mean stress space.The combined effect of the density and the effective mean stress on sand can be described by the proposed model using a unique set of model parameters in a wide range of density and confining pressure.A comparison between model simulations and experimental results shows the validity of the proposed model.
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