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为了研究破裂岩体结构面的注浆加固效果,并揭示其加固实质和作用机制,对单轴压缩试验形成的破裂岩样结构面粗糙度进行了测量与研究;通过破裂岩样结构面注浆加固的剪切试验,分析了注浆对结构面强度和刚度等力学特性参数的影响;通过锯齿形模型化结构面注浆前后剪切试验,分析了锯齿形结构面的力学特性及注浆加固对模型化结构面的影响。研究结果表明,同种岩样压裂后结构面粗糙度系数JRC相近,其数值约为8～10,具有可复制性;注浆后结构面残余强度、剪切峰值强度及上升段斜率均有明显提高;注浆后岩体中结构面的刚度也得到了明显改善;通过理论分析,给出了结构面刚度的理论拟合公式;结构面的剪切峰值强度及残余强度随着锯齿形齿数的增多明显提高,注浆加固后,结构面剪切峰值强度、黏聚力都有不同程度的增大,而内摩擦角变化不大。
In order to study the effect of grouting reinforcement on the structural plane of the ruptured rock mass and reveal the essence and mechanism of the reinforcement, the roughness of the structural plane of the ruptured rock formed by the uniaxial compression test was measured and studied. The effect of grouting on the mechanical properties such as the strength and stiffness of the structural plane is analyzed. By means of the shear test before and after the grouting of serrated profiled structural plane, the mechanical characteristics of the serrated structural plane and the grouting reinforcement Impact on the modeling surface. The results show that the fractured surface roughness coefficient JRC of the same kind of fractured rock is similar, with a value of about 8-10, and is reproducible. After the grouting, the residual strength, the peak shear strength and the slope of the ascending stage are both The stiffness of the structural plane in the rock mass after grouting has also been significantly improved. By theoretical analysis, the theoretical fitting formula of the stiffness of the structural plane is given. The peak shear strength and residual strength of the structural plane vary with the number of serrated teeth Increased obviously. After grouting reinforcement, the peak shear strength and cohesion of structural plane increased with different degrees, but the internal friction angle did not change much.