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利用滑移线场理论得到了均质弹塑性围岩发生剪切滑移破坏的滑移线场及包含破坏特征参数的极限载荷计算公式,讨论了围岩内摩擦角、黏聚力以及支护阻力对围岩承载力的影响。研究表明:深部巷道围岩受到开挖应力重分布的影响发生剪切破坏,形成明显的剪切滑移线。圆形巷道围岩破坏区滑移线场为两族仅有旋转方向不同,其他参数都相同且极点在巷道中心的斜交同心对数螺旋线。围岩内摩擦角、黏聚力以及地应力是影响巷道围岩发生剪切滑移破坏的主要影响因素,同时也是巷道稳定性控制的关键。最后根据研究成果对某矿副井发生大变形破坏的原因进行了分析,提出了以“阻剪抗滑”为技术核心的支护方案,收到了良好的效果。
Using the theory of slip-line field, the slip-line field and the calculation formula of the ultimate load including the failure parameters of shearing and slipping of homogeneous elasto-plastic surrounding rock are obtained. The influences of internal friction angle, cohesion and support Influence of resistance on surrounding rock bearing capacity. The research shows that the surrounding rock of deep roadway is affected by the stress redistribution of excavation, and the shearing failure occurs and a clear shear slip line is formed. Surrounding rock failure zone of circular roadway slip line field for the two families only rotate in different directions, the other parameters are the same and the pole in the center of the roadway diagonal concentric logarithmic spiral. The internal friction angle, cohesion and in-situ stress of surrounding rock are the main factors that affect the shear-slip failure of the surrounding rock of the roadway and are also the key to the stability control of the roadway. Finally, according to the research results, the cause of large deformation and failure of the auxiliary shaft of a mine is analyzed, and the support scheme based on the core technology of “shear-resistant and anti-skidding” is put forward, which has received good results.