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| Subsidence deformation characteristics of hard immediate roof in gob side entry retaining |
| Zhao Yang |
| Jizhong Energy Fengfeng Group Handan Baofeng Mining Co., Ltd., Jiulong Mine, Handan 056500, China |
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Abstract In this paper, the structural form of direct roof subsidence under two limit conditions was analyzed, and the two-stage subsidence displacement model of roof was constructed. The FLAC3D software was used to simulate the two-stage subsidence form of roof and the stress law of roadside body under different goaf filling conditions. The simulation results showed that when the filling rate of goaf was reduced, the two-stage structural characteristics formed by roof subsidence were more obvious, and the vertical stress of coal wall and roadside body was higher. When the filling rate of goaf was low, the hard direct roof broke near the roadside body and large deformation occurred at the roadway. Finally, taking the engineering practice of Jiulong Mine as an example, the deformation of roadway surrounding rock under different filling rates was monitored and analyzed. The research results provided a reference for the surrounding rock control of gob-side entry retaining in filling mining.
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