反映物态变化的砂土状态参数本构模型

基于状态参数Ψ、峰值应力比、相态转换应力比、依赖于状态的剪胀方程和一个双曲线的应力应变关系,建立了一个静力条件下能统一反映密度和压力对砂土变形特性影响的本构模型。该模型具有8个材料参数,都能从常规三轴试验中确定,模型能很好的模拟不同密度和不同固结压力下砂土的这些变形特性,通过数值试验初步验证了模型的合理性。

Unified State Parameter Model for Sands with Physical State Changes

A new constitutive model was developed based on the state parameter,peak stress ratio,phase transformation stress ratio,the state dependent dilatancy equation and the yield surface with a hyperbolic relationship between the stress ratio and the plastic deviatoric strain.The model with eight parameters,which could be calculated from the results of conventional triaxial test,could well represent the sand behavior with a unified way to take into account the density and confining pressure under monotonic loading.The modelling of the above deformation characteristics for sands agree reasonably well with triaxial drained test results.