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| Feasibility study on safe mining under water in Xiahuo Mine |
| Sun Dianyu |
| Lu’an Coal Industry Department, Jinneng Holding Coal Industry Group, Changzhi 047500, China |
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Abstract In order to study the safe mining feasibility of working face in Xiahuo Mine under Tianliang River on the ground, it was confirmed that the development height of water conduction fracture zone was 70 m in normal section through theoretical calculation and field measurement, and 185.8 m rock pillars remained their original permeability above the protective layer and under the bedrock weathering zone. Through the mining practice in No.2306 face, the water filling of working face was mainly roof fissure water, and the river would not have a direct impact on the water filling of underground working face through ground mining cracks. The analysis demonstrated that the fully mechanized caving mining under Tianliang River was safe and feasible.
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