【摘要】 自然界岩石是各向异性的,其破坏性也是非均匀的,岩石各向异性力学特性研究非常必要.提出了一种弹塑性破坏模型,该模型可以描述弹性变性、损伤不可逆变形和塑性变形,以二阶张量来描述损伤的扩展,损伤演化相关于微裂纹扩展标准.并以应变自由能获得有效弹性刚度矩阵,推导出了损伤参数限制范围,提出了以室内试验决定损伤参数的相应表达式.模拟了不同加载路径情况下的岩石力学行为,数值结果和试验结果较为一致.该模型被推广应用于不同加载路径的岩石水力学行为的模拟之中,数值结果显示该模型能模拟岩石孔隙水力学基本特征.更多还原

【Abstract】 Natural rock mass is anisotropic and its failing type is also non-isotropic,the research of anisotropic mechanical behaviors of rock is of importance.In this paper,an elastic-plastic damaged model has been proposed,elastic deformation,damaged irreversible deformation and plastic deformation can be identified respectively.A second rank damage tensor is employed to characterize the induced damage;damage evolution is related to the propagation conditions of microcracks. A specific form of strain free energy is used to obtain effective elastic stiffness;the limited scopes of damage parameters are deduced.The determination of anisotropic parameters is proposed by virtue of a tri-axial laboratory test,and the mechanical behaviors of different loading paths are simulated;the comparison between testing data and numerical simulations shows an overall good agreement.Then,the model is used to simulate the coupled hydraulic mechanical responses in different loading paths;the numerical results show also the proposed model is suited to describe the main features of porous hydraulic mechanical behaviors of rock.更多还原