考虑物理状态变化的砂土本构模型

Constitutive model for sand considering the variation of its physical state

本文基于临界状态理论,在已有模型的基础上,通过将状态参数引入剪胀方程和塑性硬化模量表达式,建立了一个新的砂土本构模型。该模型可以描述加载过程中相对密度和有效围压变化引起的物理状态变化对材料强度和变形特性的影响,模型形式较简单,仅有8个材料参数,适用于排水及不排水的情况。数值模拟的结果与三轴试验结果吻合较好。

Based on the theory of critical state and current used model the state parameters are introduced into the stress-dilatancy equation and the plastic hardening modulus expression to develop a new constitutive model for sand. By using this model the effect of relative density and the changing of physical state due to the variation of relative density and effective confining pressure on strength and deformation characteristics in the process of loading can be described.The model is convenient to be used, only 8 model parameters are involved. It is shown to be suitable for both drained and undrained cases. The numerical simulation is in good agreement with the data of triaxial compression tests.