Mechanism of Roof Leakage and Support Technology in Full Coal Excavation Roadway
During the excavation period of the 106 transport roadway in Wangzhuang Coal Mine,the roof is broken and leaked,resulting in high difficulty in maintaining the roof,high failure rate of support,and low excavation efficiency.From the aspects of coal seam occurrence,concentrated stress,support strength,excavation technology and so on,the mechanism of roof fragmentation and leakage in roadways is analyzed,and a combined support technology of"grouting anchor cable reinforcement+artificial false roof+dense I-shaped steel shed"is proposed.The application effect shows that after the roof of the leakage area adopting the combined support for 8 days,the roof tends to stabilize,with a maximum subsidence amount of 175 mm,and the convergence amount of two side coal pillars decreases to 250 mm.There are no leakage accidents occur in the later excavation of the roadway,and the combined support can effectively control the expansion of the roof leakage range,constrain the deformation and fragmentation phenomenon of the surrounding rock,and achieve significant application results.
国家科技期刊平台
NSTL
万方数据
