岩石与水相互作用的正交各向异性损伤数值模拟

提出一种正交损伤模型,该模型能分别描述岩石材料的弹性变形、损伤变形和其他不可逆变形能。在该模型中,以二阶损伤张量来描述损伤的发展,损伤演化相关于裂纹扩展标准。以Gibbs自由能获取损伤材料的有效刚度矩阵。以能量原理合理地推导损伤参数的限制范围,提出借助于三轴试验决定模型参数的方法。对不同加载路径的饱和砂岩试验结果进行模拟,该模型的数值结果和试验结果吻合较好。随后,推广该模型到不同加载路径下得到岩石与水相互作用的力学特性,数值结果也显示：推广的模型是可以描述岩石与水相互作用的主要水力学特性的。

NUMERICAL SIMULATION OF ORTHOTROPIC ANISOTROPIC DAMAGE CONSIDERING ROCK-WATER INTERACTION

An orthotropic anisotropic elastic damage model has been proposed,and the elastic deformation,damage deformation and other irreversible deformation can be identified respectively.A second rank damage tensor is used to characterize the induced damage with damage evolution being related to the propagation criteria of microcracks.A specific form of the Gibbs free energy function is used to obtain the effective elastic stiffness,and the limited scopes of relative anisotropic damage parameters are suggested based on the energy principle.A method for determining of all parameters of the anisotropic damage model is proposed by virtue of conventional triaxial test.The mechanical behaviors of different loading paths are described,such as proportional loading,lateral unloading;while the comparison between test data and numerical simulations shows an overall good agreement.Then,the anisotropic damage model is extended to describe the hydro-mechanical behaviors to simulate the coupled hydro-mechanical responses in different loading paths.The numerical results show that the proposed and extended model is suited to describe the main features of hydro-mechanical behaviors of rock.