基于应变状态的岩石损伤演化模型

针对基于几何特征统计的损伤张量难以描述由局部应力集中或局部变形不协调引起的损伤局部化现象问题,建立了基于材料应变状态的损伤张量,并根据弹脆性本构关系和相应的屈服准则推导损伤演化方程,研究脆性岩石材料的损伤效应.实例计算表明,基于材料应变状态建立的损伤模型有更快的损伤演化速度,更能反映脆性岩石的性质.

Damage evolution model for rocks based on strain states

Since the damage tensor based on the statistics of geometric characteristics was difficult to depict damage localization phenomenon caused by local stress concentration and local inconsistent deformation, a damage tensor was established according to the strain states of materials. The damage evolution equations were derived based on the elastic brittle constitutive relation and the corresponding yield criterion so as to study the damage effect of brittle rocks. The calculated results of an engineering case show that the proposed damage model has more quickly evolution speed and can reflect the properties of brittle rocks.