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| Optimization study on key parameters of presplitting blasting for roof cutting in thick and hard roof of gently inclined coal seam |
| Yang Dechuan1, Wang Zihao1, Liu Chang2 |
| 1. School of Mining Engineering, Anhui University of Science and Technology, Huainan 232001, China; 2. Xieqiao Mine, Huaihe Energy Holding Group, Huainan 236200, China |
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Abstract In order to solve the problem of the difficulty of falling of thick and hard roof and the impact of ore pressure caused by mining, pre-cracking blasting roof cutting pressure relief mining was adopted, the reasonable roof cutting angle range was determined by establishing the roof cutting mechanical model, and the evolution law of the stress field and displacement field of the surrounding rock of the roadway under different roof cutting heights and angles was analyzed by FLAC3D numerical simulation, and the key parameters of the optimal roof cutting were obtained, and the field application and mine pressure monitoring were carried out. The results showed that when the roof cutting height was 32 m and the roof cutting angle was 70°, the pressure relief effect was the best. The maximum displacement of the roof after roof cutting was 170 mm, the amount of the two gangs gradually increased, and the working face tended to be stable after the advancement, which verified the accuracy of the numerical simulation. This study provided a theoretical basis and practical reference for roof cutting and pressure relief technology under similar geological conditions.
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