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为研究巷道围岩的稳定性,考虑围岩损伤后弹性模量的变化,采用统一强度准则,对巷道围岩进行极限平衡状态分析,推导出巷道损伤区半径及应力分布的解析表达式,通过算例分析损伤区弹性模量、中间主应力和扩容对理论解的影响。结果表明:损伤区半径随扩容系数的增大而增大;随着损伤区弹性模量的增大,损伤区半径逐渐增大,切向应力峰值逐渐减小且距离巷道壁面越远;中间主应力系数越大,损伤区半径越小,切向应力峰值越大且离巷道壁面越近。
In order to study the stability of roadway surrounding rock and considering the change of elastic modulus after surrounding rock damage, the unified strength criterion is used to analyze the limit equilibrium state of surrounding rock of roadway, and the analytical expression of radius and stress distribution in roadway damage area is deduced. An example is given to analyze the influence of elastic modulus, intermediate principal stress and expansion on the theoretical solution in the damaged zone. The results show that the radius of the damage zone increases with the increase of the expansion coefficient. With the increase of the elastic modulus in the damage zone, the radius of the damage zone gradually increases, the peak value of the tangential stress decreases and the distance from the wall of the roadway decreases. The bigger the stress coefficient is, the smaller the radius of damage zone is, the larger the peak value of tangential stress is and the closer it is to the wall of the roadway.