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通过理论分析与数值模拟相结合的方法,分析了双结构面对岩体强度的影响.研究表明,影响结构面滑移变形的主要因素有应力集中系数、采深、结构面倾角和结构面的力学参数.在结构面力学参数一定的情况下,应力集中系数越大及采深越大,结构面产生滑移变形的可能性越大;结构面倾角越小,产生滑移变形的可能性越大.采空区上部小角度结构面产生滑移变形是导致离层、产生底鼓的机制之一;两个弱面之间相互干扰、叠加影响了岩体的抗压强度,当两个弱面中有任一个弱面与轴线成30°时岩体抗压强度最小.
Through the combination of theoretical analysis and numerical simulation, the influence of the double structural plane on the strength of the rock mass is analyzed. The results show that the main factors affecting the structural plane sliding deformation are stress concentration factor, mining depth, structural inclination angle and structural plane Mechanical parameters.When the mechanical parameters of the structural plane are constant, the larger the stress concentration factor and the larger the mining depth, the greater the probability of sliding deformation of the structural plane. The smaller the structural plane inclination is, the more the possibility of sliding deformation Large. The slip deformation of the small angle structure surface in the upper part of the goaf is one of the mechanisms leading to the layer separation and the formation of the kick drum. The mutual interference between the two weak surfaces affects the compressive strength of the rock mass. When two weak The compressive strength of the rock mass is the smallest when any one of the weak faces is 30 ° to the axis.