基于状态参数的粗粒土应变软化和剪胀性模型研究

基于状态参数的概念，将粗粒土峰值应力比和剪胀比视为状态参数的函数，同时考虑初始模量随围压的变化，提出了一个弹塑性模型和模型参数的确定方法。该模型形式较简单，概念清晰，可以描述较大的密度和压力范围内粗粒土的应变软化和剪胀性，以及它们对物理状态和有效围压的依赖性。通过比较模型预测与粗粒土的三轴试验结果，证明了模型的合理性。

Study of strain softening and dilatancy modelling based on state parameter of coarse grained soil

Based on the concept of state parameter, the peak stress ratio and dilatancy ratio are regarded as the function of state parameter; and meanwhile the initial modulus changing with confining pressure is considered; then an elastoplastic model for coarse grained soils and its parameter calibration are proposed. The model expression is simple and its concept is clear; it can describe the strain softening and dilatancy over a full range of densities and stress levels and its dependency on physical state and eff...