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为了从细观角度模拟裂隙岩石的破坏过程,利用颗粒流软件(PFC)构建了裂隙岩石的单轴压缩模型,模拟了含非闭合裂隙和闭合裂隙岩石的单轴压缩试验,并分析了裂隙闭合情况和裂隙摩擦系数对裂隙岩石强度和破坏模式的影响。结果表明,裂隙闭合与未闭合对裂隙岩石的破坏特征存在影响,裂隙闭合后,裂隙峰值强度随摩擦系数增大而增大;裂隙岩石宏观张拉破坏面由翼型裂纹扩展贯通形成,宏观剪切破坏面由次生裂纹的扩展贯通形成;当f=0、α≥67.5°或f≥0.75、α=45°时,翼型裂纹几乎不产生;当f=0、α=90°或f=1、α=45°时,裂隙岩石强度和破坏模式接近于完整岩石。
In order to simulate the failure process of fissured rocks from a microscopic point of view, a uniaxial compression model of fissured rocks was constructed by using particle flow software (PFC) to simulate the uniaxial compression tests of rocks with non-closed fractures and closed fractures. The fracture closure Effect of Friction and Fracture Friction Coefficient on Fracture Rock Strength and Failure Modes. The results show that the failure characteristics of fractured rock are affected by the closed and unclosed fractures. After closed, the peak strength of fractured rock increases with the increase of friction coefficient. The macroscopic tensile failure surface of fractured rock is formed by airfoil crack propagation. The macroscopic shear When f = 0, α≥67.5 ° or f≥0.75, α = 45 °, the airfoil cracks hardly occur; when f = 0, α = 90 ° or f = 1, α = 45 °, the fracture rock strength and failure mode are close to that of intact rock.