Geomechanics and Engineering

  • 제18권4호
  • /
  • Pages.449-457
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  • 2019
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Failure pattern of large-scale goaf collapse and a controlled roof caving method used in gypsum mine

  • Chen, Lu (School of Civil Engineering, Changsha University of Science and Technology) ;
  • Zhou, Zilong (School of Resources and Safety Engineering, Central South University) ;
  • Zang, Chuanwei (School of Mining and Safety Engineering, Shandong University of Science and Technology) ;
  • Zeng, Ling (School of Civil Engineering, Changsha University of Science and Technology) ;
  • Zhao, Yuan (School of Resources and Safety Engineering, Central South University)
  • 투고 : 2018.04.06
  • 심사 : 2019.07.01
  • 발행 : 2019.07.20
⟨ 이전 논문 다음 논문 ⟩

초록

Physical model tests were first performed to investigate the failure pattern of multiple pillar-roof support system. It was observed in the physical model tests, pillars were design with the same mechanical parameters in model #1, cracking occurred simultaneously in panel pillars and the roof above barrier pillars. When pillars 2 to 5 lost bearing capacity, collapse of the roof supported by those pillars occurred. Physical model #2 was design with a relatively weaker pillar (pillar 3) among six pillars. It was found that the whole pillar-roof system was divided into two independent systems by a roof crack, and two pillars collapse and roof subsidence events occurred during the loading process, the first failure event was induced by the pillars failure, and the second was caused by the roof crack. Then, for a multiple pillar-roof support system, three types of failure patterns were analysed based on the condition of pillar and roof. It can be concluded that any failure of a bearing component would cause a subsidence event. However, the barrier pillar could bear the transferred load during the stress redistribution process, mitigating the propagation of collapse or cutting the roof to insulate the collapse area. Importantly, some effective methods were suggested to decrease the risk of catastrophic collapse, and the deep-hole-blasting was employed to improve the stability of the pillar and roof support system in a room and pillar mine.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China

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피인용 문헌

  1. Research on the Disintegration Characteristics of Carbonaceous Mudstone and Properties of Modified Materials vol.2019, 2019, https://doi.org/10.1155/2019/4382054
  2. Influencing Factors for the Instability and Collapse Mode of the Goaf Structure in a Gypsum Mine vol.2021, 2019, https://doi.org/10.1155/2021/5577287
  3. Dynamic stability analysis of rock tunnels subjected to impact loading with varying UCS vol.24, pp.6, 2019, https://doi.org/10.12989/gae.2021.24.6.505