CAJ | 학술논문

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.
자연계암석시각향이성적,기파배성야시비균균적,암석각향이성역학특성연구비상필요.제출료일충탄소성파배모형,해모형가이묘술탄성변성、손상불가역변형화소성변형,이이계장량래묘술손상적확전,손상연화상관우미렬문확전표준.병이응변자유능획득유효탄성강도구진,추도출료손상삼수한제범위,제출료이실내시험결정손상삼수적상응표체식.모의료불동가재로경정황하적암석역학행위,수치결과화시험결과교위일치.해모형피추엄응용우불동가재로경적암석수역학행위적모의지중,수치결과현시해모형능모의암석공극수역학기본특정.
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.