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| Study on the feasibility of up-mining near coal seam in Qianjiaying Mine |
| Liu Jianjun1， Liu Jianzhuang2， JingXueying1 |
| 1. Kailuan Energy Chemical Co., Ltd., Tangshan 063012, China; 2. Hebei Key Laboratory of Mineral Development & Security Technology, North China University of Science and Technology, Tangshan 063210, China |
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Abstract Based on the background of 1692 working face of Qianjiaying Coal Mine, the feasibility of upward mining of No. 9 coal seam is studied by using ratio discrimination method, "three zones" discrimination method, surrounding rock balance method and numerical simulation method. The results show that the 1692 working face of coal seam 9 is located in the fracture zone above the caving zone of coal seam 12, which is less affected by mining, and the distance between coal seams also meets the requirements of upward mining. Through the comparative analysis of the two mining modes of upward mining and downward mining, it is concluded that compared with the downward mining, the working face and roadway are in the low stress area, which is beneficial to the layout of roadway and stope pressure management. It can be seen from this study that the upward mining of 9 coal seam is feasible.
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