【作者】 杨天鸿； 于庆磊； 王善勇； 梁正召； 唐春安； 谭国焕；

【Author】 YANG Tian-hong, YU Qing-lei, WANG Shan-yong, LIANG Zheng-zhao, TANG Chun-an, L. G Tham (Key Laboratory of Rock and Soil Mechanics, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; Center for Engineering Mechanics Research, Northeastern University, Shenyang 110006, China; Department of Civil Engineering, University of Hong Kong, Hong Kong)

【机构】 中国科学院岩土力学重点实验室； 东北大学工程力学研究所； 香港大学土木工程系；

【摘要】 应用自主开发的数值模拟系统F-RFPA2D,研究荷载和水压力作用下岩石裂纹和内部缺陷结构相互作用下的贯通过程,内容包括岩石应力应变过程中,不同裂纹扩展阶段的渗透率演化规律,水压力对裂纹扩展模式和峰值强度的影响,岩石内部缺陷结构对裂纹贯通模式的影响等。结果表明,水压力和缺陷结构分布的非均匀性对岩石的应力峰值强度、峰值前后渗透性演化规律及裂纹贯通机制影响十分明显。更多还原

【Abstract】 The coupling action of seepage and fracture on crack coalescence process under loading and hydraulic pressures are investigated. Numerical results demonstrate that the trend and magnitude of the permeability variations are controlled by the stress and the damage evolution developed in rocks. This includes the induced stress evolution of flow properties, and the regions of both diminished and enhanced flow depending on which the rock is in the linear-elastic, nonlinear, or post-failure portions of the stress-strain curves are presented. In elastic deformation region, rock permeability reduces when the rock compacts, and the decrease rate of the permeability starts to slow down or gradually to increase again when micro fractures begin to nucleate. Dramatic permeability increase occurs as soon as the macro-fracture forms in the rock.更多还原