Research on Surrounding Rock Control Technology for Small Coal Pillar Roadway Excavation Along Goaf in Isolated Island Fully Mechanized Caving Face
In order to improve the coal resource recovery rate of the 15106 isolated island working face in Tongbao Coal Industry,it is put forward that the technology of roadway excavation along goaf with leaving small coal pillar should be adopted to construct the auxiliary transportation groove.Through theoretical calculation and numerical simulation analysis,the width of the small coal pillar is determined to be 8 m,and a joint support scheme of"anchor mesh cable+coal pillar side anchor cable beam reinforcement+broken section coal pillar side roadway side grouting reinforcement"is proposed.The application results show that the maximum displacement amount of the coal pillar side and solid coal side is 223.56 mm and 68.36 mm,respectively,the maximum subsidence amount of the roof is 216.52 mm,and the maximum bulge amount at the bottom is 172.54 mm.The deformation and control effect of the surrounding rock of the roadway along goaf is significant.In addition,after adopting the technology of small coal pillar roadway excavation along goaf,the width of the section coal pillar is reduced from 25 m to 8 m,and about 101 500 tons of coal pillar resources can be recovered more,with significant economic benefits.
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