松软破碎岩层大断面硐室定位注浆加固技术研究

针对松软破碎不稳定岩层中巷道变形量大、底鼓、矿压显现持续时间长等情况，先利用钻孔窥视仪探明石草台煤矿井下变电所围岩中呈现松软破碎特性的位置后，设计利用注浆锚索、注浆锚杆通过定位注浆加固不稳定围岩并辅以反悬拱控制底鼓的形式，提高了巷道围岩整体承载能力，保证了巷道支护效果，同时降低了巷道后期维护成本。

Research on the Technology of Roadway Positioning Grouting Reinforcement in Large Section of Soft Broken Rock

Due to the limitation of geological conditions and engineering conditions, some roadways in coal mine can not avoid unstable rock formations and need to be constructed in unstable rock formations. In this paper, under the conditions of large deformation of roadway, long time of bottom dropsy and mine pressure, the soft and broken position of rock surrounding a mine substation is discovered. It is proposed to use grouting anchor to reinforce unstable surrounding rock with anti-suspension arch to control the bottom dropsy, improve the overall bearing capacity of roadway surrounding rock, ensure the effect of chamber support, and reduce the maintenance cost in the later period of chamber.