Geomechanics and Engineering

  • 제36권1호
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  • Pages.27-37
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  • 2024
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Stability analysis of roof-filling body system in gob-side entry retained

  • Jinlin Xin (Key Laboratory of Coal Mine Gas and Roof Disaster Prevention and Control, Hunan University of Science and Technology) ;
  • Zizheng Zhang (Key Laboratory of Coal Mine Gas and Roof Disaster Prevention and Control, Hunan University of Science and Technology) ;
  • Weijian Yu (Key Laboratory of Coal Mine Gas and Roof Disaster Prevention and Control, Hunan University of Science and Technology) ;
  • Min Deng (Key Laboratory of Coal Mine Gas and Roof Disaster Prevention and Control, Hunan University of Science and Technology)
  • 투고 : 2021.08.18
  • 심사 : 2023.11.28
  • 발행 : 2024.01.10
⟨ 이전 논문 다음 논문 ⟩

초록

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.

키워드

과제정보

The project was supported by the Key Research and Development Special Tasks of Xinjiang Province (No. 2022B01051), Key projects of the Joint Fund of the National Natural Science Foundation of China (No. U21A20107), the Open Fund of the State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology (No. SKLMRDPC20KF08), and Funded by the Excellent Youth Fund of the Education Department of Hunan Province (Grant No. 21B0487).

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