摘要
节理岩体在剪切力作用下的破坏方式常表现为相邻节理的扩展与贯通，因此，研究含预制多裂纹岩打的抗剪强度和破坏模式对工程设计具有重要意义。应用RFPA系统对含断续裂纹剪切试样的断裂过程进行了数值模拟研究，讨论了不同裂纹几何分布对破坏模式和峰值强度的影响。研究结果表明。在相同围压条件下，裂纹贯通模式丰要受裂纹的几何方位控制：由于试样细观缺陷非均匀性的存在，导致岩行断裂主要由拉伸破坏引起，但拉剪混合破坏仍然存在，并对抗剪强度有较大的影响。
The failure of jointed rock under shear loading is commonly demonstrated as propagation and coalescence between neighboring fractures, therefore, it is of great importance for engineering design to study shear strength and failure pattern of jointed rock with several pre-existing joints. Rock Failure Process Analysis code （RFPA^2D） is employed to simulate the failure process of rock specimen with several discontinuous flaws under shear testing. The influence of flaws＇ geometrical characteristic on failure pattern and shear strength is discussed. The results demonstrate that the failure patterns are mainly controlled by the flaws＇ geometrical characteristics. Due to the heterogeneity, rock failure mainly results from tensile damage but shear damage still exists, which has influence on the shear strength.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第A01期5136-5140,共5页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目（50490274,50374020,50474017）
关键词
岩石力学
断续裂纹
非均匀性
剪切
数值试验
rock mechanics
discontinuous flaws
heterogeneity
shear
numerical tests
