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| Research on gas control technology of 110 construction method in medium thick coal seam of Huangling No.1 Coal Mine |
| Shi Xinyu |
| No.1 Coal Mine of Shaanxi Shaanxi Coal Huangling Mining Co., Ltd., Yan 'an 727306, China |
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Abstract The co-mining of coal and gas under non-pillar mining of roof-cutting entry retaining is an important development direction of non-pillar mining technology in China.In order to solve the problem of pressure-relief gas control under the condition of 110 mining method in medium-thick coal seam of Huangling No.1 Coal Mine in Shaanxi Province, the combination of theoretical analysis and numerical simulation was used to analyze the change of overburden structure and fracture distribution caused by roof-cutting entry retaining. The results show that according to the change characteristics of roof structure state in the mining process of 110 method, the structure movement of surrounding rock in roof cutting and retaining roadway is divided into four stages. After the working face is fully mined, the height of the caving zone is basically no longer changed, and it is stable at about 7 m. The development height of the fracture zone is about 55 m, and the stress concentration coefficient is about 2.73. The fractures in the caving zone in the middle of the goaf are basically in a state of compaction and closure. The width of the fracture zone is about 40 m, the fracture angle of the rock stratum at the open-off cut is 67°, and the fracture angle of the rock stratum at the stop of the working face is about 62°. According to the fracture distribution characteristics under the non-pillar mining technology of the 1009 working face, the directional high-level test borehole was constructed, and the on-site extraction effect was good. The problem of gas concentration overrun in the 1009 return airway was effectively controlled, and the safe mining of the 1009 working face was realized.
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