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| Stress distribution and support technology in the whole process of gob-side entry driving and mining in deep thick coal seam |
| Yu Yang |
| Yuandian Yijing Mine of Huaibei Mining Co., Ltd., Huaibei 235000, China |
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Abstract In order to solve the problem of surrounding rock control of gob－side roadway in deep and thick coal seam under repeated loading and unloading, the return airway of No. 1037 Face of Yuandian Yijing Mine was taken as the engineering background, the whole process stress distribution characteristics and evolution law of gob－side roadway under repeated loading and unloading were systematically studied by FLAC3D numerical simulation. The combined support scheme of "anchor belt net cable + spray grouting on the side + reinforcement of asymmetric anchor beam in roof + anchor beam reinforcement at the bottom angle of coal pillar shoulder " was put forward. The results showed that: ① The peak value of lateral abutment pressure in goaf at the upper working face was 12 ~ 13m away from the coal wall, which is about 27.5MPa. The influence range was 60 ~ 70m. ② After excavation of air roadway at No.1037 Face, the vertical stress peak shifted to the deep of solid coal, about 17m away from the coal wall of goaf, about 30.7MPa, which increased by 11.6% compared with that before excavation, and the vertical stress on small coal pillar decreased by about 62.6% compared with that before excavation. ③When No. 1037 face was advanced, the peak abutment pressure reached 45.9MPa 20m ahead of the working face, which was about 2.8 times the stress of the original rock. Field observation results showed that the control scheme achieved a better control effect.
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