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针对色连二矿12205工作面回采时辅助运输巷围岩变形破坏严重的问题,从巷道围岩岩性、应力变化、水的弱化作用及原支护结构失稳4个方面分析了巷道围岩失稳的原因,提出了回采巷道加固支护方案,应用FLAC~(3D)数值模拟软件对原支护方案与加固方案进行对比分析。结果表明:工作面回采前加补顶板锚索与增打两帮走向锚索,巷道围岩中垂直应力峰值位置向巷道边缘移动了0.9 m,巷道顶底板与两帮移近量分别降低了274 mm与240 mm,巷道围岩的塑性破坏区范围最小。现场实践表明:工作面回采影响期间,辅助运输巷采用加固支护方案后,顶底板及两帮累计移近量比未加固段平均降低了约50%,该巷道加固支护方案取得预期的效果。
Aiming at the severe deformation and failure of the surrounding rock of the secondary transportation lane when the 12205 working face of Seamian No.2 Mine is mining, the surrounding rock of the roadway is analyzed from the aspects of the lithology and stress of the surrounding rock, the weakening effect of water and the instability of the original supporting structure. The reason of instability is proposed and the reinforcement support plan of mining roadway is proposed. The contrastive analysis of the original support plan and reinforcement plan is made by using FLAC 3D numerical simulation software. The results show that the peak position of vertical stress in the surrounding rock of the roadway moves 0.9m to the edge of the roadway, and the top and bottom floor of the roadway and the amount of the two approaches move down 274 mm and 240 mm, the plastic rock mass surrounding the area of the smallest damage. The field practice shows that: During the influence of face mining, the reinforcement plan of the auxiliary transportation lane can reduce the average floor top floor and the two approaches by about 50% compared with the un-reinforced section, and the reinforcement support plan of the roadway achieves the expected result .