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Geomechanics and Engineering Volume 36, Number 1, January10 2024 , pages 27-37 DOI: https://doi.org/10.12989/gae.2024.36.1.027 |
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Stability analysis of roof-filling body system in gob-side entry retained |
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Jinlin Xin, Zizheng Zhang, Weijian Yu and Min Deng
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| Abstract | ||
| The roof-filling body system stability plays a key role in gob-side entry retained (GER). Taking the GER of the 1103 belt transportation roadway in Heilong Coal Mine as engineering background, stability analysis of roof-filling body system was conducted based on the cusp catastrophe theory. Theoretical results showed that the current design parameters of 1103 belt transportation roadway could ensure the roof-filling body system stable during the resistance-increasing support stage of the filling body and the stable support stage of the filling body. Moreover, a verified global numerical model in FLAC3D was established to analyze the failure characteristics including surrounding rock deformation, stress distribution, and plastic zone. Numerical simulation indicated that the width-height ratio of the filling body had a great influence on the stability of the roof-filling body system. When the width-height ratio was greater than 0.62, with the decrease of the width-height ratio, the peak stress of the filling body gradually decreased; when the width-height ratio was greater than 0.92, as the distance to the roadway increased, the roof stress increased and then decreased. The theoretical analysis and numerical simulation findings in this study provide a new research method to analyze the stability of the roof-filling body system in GER. | ||
| Key Words | ||
| cusp mutation; gob-side entry retained; numerical simulation; roof-filling body system; stability analysis | ||
| Address | ||
| Jinlin Xin, Weijian Yu and Min Deng: Key Laboratory of Coal Mine Gas and Roof Disaster Prevention and Control, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China Zizheng Zhang: Key Laboratory of Coal Mine Gas and Roof Disaster Prevention and Control, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China; State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, China | ||