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通过三轴压缩试验,对预制张开裂隙岩样在不同围压下裂隙参数(裂隙倾角、裂隙长度)对岩样的强度和变形破坏特征的影响规律进行了研究,并对裂隙岩样的破坏机制进行了探讨。结果表明:1)在围压相同、倾角相同条件下,裂纹长度对峰值强度的影响较大,裂纹越长,其峰值强度越小,而裂隙倾角对岩样峰值强度影响不大;2)裂隙岩样残余强度阶段的粘聚力下降严重,说明残余强度阶段试件已形成宏观贯通的裂缝,其承载力主要由裂隙面间的摩擦力承担;3)预制裂隙岩体的弹性模量随围压的增加经历了先减少再增加的非线性变化。
Through the triaxial compression test, the influence laws of the crack parameters (crack dip angle and crack length) under different confining pressures on the strength and deformation characteristics of rock specimens were studied, and the fracture rock samples were destroyed Mechanism is discussed. The results show that: 1) Under the same confining pressure and same inclination angle, the influence of crack length on the peak strength is greater. The longer the crack is, the smaller the peak intensity is, while the crack angle has little effect on the peak intensity of the rock specimen. 2) The cohesive force of the residual strength of rock samples decreases seriously, which indicates that the residual strength of the specimens has formed macroscopic cracks, and its bearing capacity is mainly assumed by the friction between the cracks. 3) The increase in pressure experienced a non-linear change that first decreased and then increased.