沿空掘巷窄煤柱巷道底鼓破坏与控制技术研究

Research on Floor Heave Damage and Control Technology of Narrow Coal Pillar Roadway Driving along Goaf

为研究沿空掘巷底鼓破坏与控制技术,以王家河矿4209回风顺槽为研究背景,根据巷道开采技术条件分析了沿空巷道底鼓破坏特征:巷道底鼓呈非对称破坏,最大底鼓量达到850 mm,最大底鼓深度1.38 m,底鼓区域最大离层量236 mm,最大裂隙宽度46 mm。分析了护巷煤柱、支护方案、围岩应力、围岩强度对底鼓破坏的影响,在此基础上给出了护巷煤柱合理加固技术方案,对巷道支护方案进行优化研究,并给出了底板卸压与加固方案。最后,将底鼓控制技术用于工程实践。实践表明,巷道底鼓控制技术合理有效,底板变形得到了有效控制,较好地满足了工作面安全通风及辅助运输要求。

In order to study the floor heave damage and control technology of gob side entry driving,taking 4209 return air entry of Wangjiahe mine as the research background, the floor heave damage characteristics of gob side entry were analyzed according to the technical conditions of roadway mining:the floor heave was asymmetric damage, the maximum floor heave was 850 mm, the maximum floor heave depth was 1.38 m, the maximum bed separation in floor heave area was 236 mm, and the maximum crack width was 46 mm. The influence of coal pillar, support scheme, surrounding rock stress and strength on floor heave damage were analyzed. On this basis, the reasonable reinforcement technical scheme of roadway pillar was given, the roadway support scheme was optimized, and the floor pressure relief and reinforcement scheme was given. Finally, the floor heave control technology was applied to engineering practice. The practice shows that the floor heave control technology is reasonable and effective, and the floor deformation is effectively controlled, which can better meet the requirements of safe ventilation and auxiliary transportation.