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| Study on Characteristics of Collapse Column and Optimization of Mining Scheme in Gequan Mine |
| Liu Yinbo |
| Gequan Mine of Jizhong Energy Resources Group Co., Ltd., Xingtai 054100, China |
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Abstract In order to ensure the safety of working face in the process of mining, laboratory analysis and numerical simulation were used to study the characteristics of collapse column and mining optimization in Gequan Mine. Sampling in the collapse column, laboratory analysis showed that the collapse column of Gequan Mine had the characteristics of dense internal structure, high cementation, common scratches and traction near the contact surface, and clear interface. The numerical simulation showed that the outlet water of collapse column working face was closely related to the change of ground pressure during mining. A certain width of protective coal pillar should be set for the collapse column in the working face, but after grouting reinforcement was carried out around the collapse column, the scheme of direct mining could be adopted to achieve safe production.
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