岩石的弹塑性扰动状态本构模型

假定岩石的相对完整状态符合分级单屈服面(HISS)模型并考虑其各向同性硬化,岩石的完全调整状态对应于理想刚塑性,通过定义扰动函数,则岩石应力峰值后的软化行为可用HISS模型叠加扰动进行描述,从而建立基于扰动状态概念理论的岩石弹塑性本构模型.利用RMT-150B对焦作砂岩进行单轴、三轴压缩破坏试验,以确定本构模型中的材料参数.应用建立的弹塑性本构模型,对岩石在单轴应力状态下的力学响应进行了描述.研究结果表明,建立的弹塑性本构模型能描述单轴下岩石的应力-应变全过程.

An elasto-plastic constitutive model of rock based on the disturbed state concept theory

The relative intact(RI) state of rock is modeled with the hierarchical single-surface(HISS) model,and the fully adjusted(FA) state of rock is defined as a rigid perfectly plastic state.The behavior of material consists of the two states.By defining the disturbed function,an elasto-plastic constitutive model of rock is established based on the disturbed state concept(DSC).Uniaxial and triaxial compressive failure tests of Jiaozuo sandstone specimens are performed with an RMT-150B rock mechanics test system.The proposed constitutive model is used to predict the mechanics response of the sandstone specimens.The results show that the proposed constitutive model can simulate the complete stress-strain curves of sandstone specimens.