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| Study on safety evaluation of mining floor in No.10 coal seam of Haocun Mine |
| Yang Guangyuan |
| No.312 geological team, Anhui Bureau of Geology and Mineral Exploration, Huaibei 235000, China |
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Abstract During the mining of No.10 coal seam in Haocun Mine, it was greatly threatened by the Ordovician limestone aquifer in the floor. Based on the hydrogeological conditions of coal seam mining, this paper evaluated the safety of No.10 coal seam mining in Haocun Mine with the index of floor permeability resistance capacity based on the test of coal seam floor failure depth and water resistance capacity. The results showed that the water outburst coefficient of the floor in the central and northern parts of the minefield was greater than 0.06 MPa / m, which was more prominent by the threat of Ordovician limestone. The maximum depth of floor failure in No.10 coal seam mining was 11.5 m ; in the process of underground multi-hole connection pressure seepage test, the monitoring pressure was characterized by slow increase-rapid increase-stablity, and the seepage pressure value and stable water pressure value of each layer were obtained. The safety factor ( A ) of the South No.1 mining area was greater than 1, and safe mining could be achieved under normal conditions. The research laid a foundation for the safe mining of No.10 coal seam in Haocun Mine.
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