特厚煤层小煤柱沿空掘巷围岩控制技术实践

Practice on Controlling the Surrounding Rock along Roadway with Small Coal Pillar in Extra-thick Coal Seam

为了解决特厚煤层大采高综放开采强动压影响下小煤柱沿空掘巷围岩控制难题,结合马道头矿5211回风顺槽地质情况,分析了留小煤柱沿空掘巷的关键技术及巷道锚网支护技术,并进行了井下试验。试验结果表明:通过确定合理煤柱宽度、切顶卸压以及高强锚网支护后,巷道围岩变形量较小,围岩稳定可控,满足安全使用要求。

In order to solve the problem of surrounding rock control of gob side entry of small coal pillar under the influence of strong dynamic pressure,combined with the geological situation of 5211 return air chute in Madaotou Mine,the key technology of gob side entry of small coal pillar and the supporting technology of roadway anchor net are analyzed,and the underground test is carried out.The test results show that,after determining the reasonable width of coal pillar,pressure relief of cutting top and high strength anchor net support,the deformation of the surrounding rock is small,the surrounding rock is stable and controllable,and meets the requirements of safe use.