岩体在冲击载荷作用下的各向异性损伤模型及其应用

ANISOTROPIC DAMAGE MODEL AND ITS APPLICATION TO ROCK MATERIALS UNDER IMPACT LOAD

建立了一个各向异性的损伤模型,用于描述岩土工程中预留岩体在冲击载荷下的损伤演化特征。以二阶张量为损伤变量,推导了依赖于损伤变量的弹性模量表达式,利用一个等价状态,建立损伤岩体的本构关系。为了反映冲击载荷下岩石材料的应变率敏感性,对损伤的门槛值进行粘性调整。研究结果表明,该损伤模型能够模拟岩石材料在冲击载荷下的损伤特征,可以为岩土工程中经历过冲击扰动作用的岩体的稳定性分析提供理论依据。

An anisotropic damage model is established to describe the damage evolution characteristics of remaining rock masses in geotechnical engineering. A second-order tensor is chosen as the damage variable. Then the expression of damage-dependent elasticity tensor is deduced and the constitutive equations of damaged rock are built by using an equivalent state. The damage threshold is regularized in order to reflect strain-rate sensitivity of rock materials under impact load. The results of research indicate that damage model can simulate damage characteristics of rock materials under impact load and provide theoretical evidences for stability analysis of rock that has been disturbed by impact load in geotechnical engineering.