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节理岩体具有特殊的不连续结构,从而展现出复杂的各向异性力学特性。为了掌握这一复杂力学特性,从理论上分析了单一节理面的力学效应,并通过常规三轴压缩试验研究了单一预制贯通节理试件的各向异性力学特性。结果表明,节理试件的力学特性分为受节理面控制和岩块控制;与完整试件相比,节理试件的力学参数均有不同程度降低,其中弹性模量、抗压强度、黏聚力随节理倾角呈U型分布,最小值均出现在60°倾角节理试件,而内摩擦角与节理倾角呈线性增大关系;随着围压等级升高,不同倾角节理试件弹性模量和抗压强度的最大值与最小值的比值降低,力学性能差异减小。
The jointed rock mass has a special discontinuous structure, thus exhibiting complex anisotropic mechanical properties. In order to grasp this complex mechanics characteristic, the mechanics effect of a single joint was theoretically analyzed and the anisotropic mechanical properties of a single precast through-the-bolt joint were studied by the conventional triaxial compression test. The results show that the mechanical properties of joint specimens are divided into control of joint surface and control of rock mass. Compared with the intact specimens, the mechanical parameters of joint specimens decrease to some extent, among them, the elastic modulus, compressive strength, With the inclination of joint appears U-shaped distribution, the minimum appears in the 60 ° dip joint specimen, and the internal friction angle and the joint inclination showed a linear increase; as the confining pressure level increases, different dip joint specimen elastic modulus And compressive strength of the maximum and minimum ratio decreased, the difference in mechanical properties decreased.