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针对单一岩石界面的注浆加固强度问题,分析结构面剪切破坏机制以及黏结力与摩擦力的耦合效应,并开展规则锯齿状结构面剪切试验。对三维条件下结构面粗糙程度的各向异性及其表征方法进行分析。依据结构面微凸体倾角与剪切方向的关系,提出摩擦力主控区域与黏结力主控区域的划分。基于无黏结强度时结构面的抗剪强度准则,以及结构面黏结力作用机制,建立单一界面注浆加固体的抗剪强度计算公式,计算表明,注浆材料的黏结力作用受结构面粗糙度各向异性的影响显著。注浆加固后,结构面的抗剪强度沿各个方向均得到提升,但结构面的抗剪强度仍然存在明显的各向异性。研究结果为岩体注浆加固效果提供了评判依据。
Aiming at the problem of grouting reinforcement strength at a single rock interface, the shear failure mechanism of structural plane and the coupling effect between cohesion and friction are analyzed, and the regular serrated structural plane shear test is carried out. The anisotropy of the roughness of the structural plane under three-dimensional conditions and its characterization method are analyzed. According to the relationship between the inclination of asperity and the shear direction, the division of the main control area of friction force and the main control area of adhesion force is proposed. Based on the shear strength criterion of the structural plane without bond strength and the mechanism of the bond strength of the structural plane, the formula for calculating the shear strength of the grouted consolidation body with a single interface is established. The calculation results show that the bond force of the grouting material is affected by the roughness of the structural plane The effect of anisotropy is significant. After grouting reinforcement, the shear strength of the structural plane is improved in all directions, but the shear strength of the structural plane still shows obvious anisotropy. The results provide the basis for the judgment of rock grouting reinforcement effect.