Geomechanics and Engineering

  • 제27권1호
  • /
  • Pages.75-85
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  • 2021
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Mechanical model of lateral fracture for the overlying hard rock strata along coal mine goaf

  • Zhao, Shankun (School of Energy and Mining Engineering, China University of Mining and Technology Beijing) ;
  • Sui, Qiru (School of Energy and Mining Engineering, China University of Mining and Technology Beijing) ;
  • Cao, Cong (School of Energy and Mining Engineering, China University of Mining and Technology Beijing) ;
  • Wang, Xuecheng (School of Energy and Mining Engineering, China University of Mining and Technology Beijing) ;
  • Wang, Chunlai (School of Energy and Mining Engineering, China University of Mining and Technology Beijing) ;
  • Zhao, Daming (School of Energy and Mining Engineering, China University of Mining and Technology Beijing) ;
  • Wang, Yin (School of Energy and Mining Engineering, China University of Mining and Technology Beijing) ;
  • Zhao, Yang (Safety Technology Branch, CCTEG China Coal Research Institute)
  • 투고 : 2021.01.12
  • 심사 : 2021.09.29
  • 발행 : 2021.10.10
⟨ 이전 논문 다음 논문 ⟩

초록

Considering the continuous development of gob side entry driving technology, the influence of roof fracture on coal pillar is difficult to be accurately predicted. In order to explore the fracture structure characteristics of the overlying multi thick hard rock strata and its influence on coal pillars, the stress analysis tests of coal pillars under different roof fracture positions were designed. Different fracture positions of immediate roof and high-level thick hard rock were simulated by different corresponding positions of goaf, coal pillar edge line and rotary fixture line. According to four experimental design schemes, the strain distribution of coal mine goaf under different roof fracture combination positions was obtained. By analyzing the results of digital speckle pattern experiment, the distribution range and form of stress above coal pillar and low level thick hard rock are obtained, which provides theoretical basis for studying the whole process of coal pillar fracture.

키워드

과제정보

This work was jointly supported by the National Natural Science Foundation of China (Grant No. 52074294), the National Key Research and Development Project (Grant No. 2017YFC0804201, 2017YFC0804203).

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