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| Research on Safety Mining of Inclined Penetrating Fault Reinforced by Grouting in Thick Loose Layer and Thin Bedrock Working Face |
| Lei Yu1， Wang Youfeng2，Cao Siwen2， Zhang Qiang2， Zhang Min2 |
| 1. College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China；
2. Yangcun Mine of Yankuang Energy Group Company Limited. Yanzhou 272118, China |
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Abstract Water and sand inrush disasters often occur when mining under loose aquifer is limited. Especially when faults exist in thin overburden rock in working face, water and sand inrush disasters are more likely to occur, which seriously threaten mine safety production. In Yangcun mine, the Poluoshu No. 2 fault runs through the whole working face diagonally, and the minimum vertical height of the coal pillar mined along the bottom is slightly greater than the minimum vertical height of the coal pillar left with sand protection. In order to ensure the safety of the working face mining, the theoretical prediction and numerical simulation methods are used. The failure height of overlaying rock and the safety of working face mining through oblique fault were analyzed, and the idea of fault grouting reinforcement to realize working face safety production was put forward. The fault grouting reinforcement scheme was designed, and the effect of grouting reinforcement was tested on the underground site. Combined with the corresponding safety technical measures, the safety mining of 330 working face is successfully completed. The research results have certain guidance and reference significance to realize the safe mining of thick unconsolidated bed and extremely thin bedrock working face under the influence of fault structure.
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