Geomechanics and Engineering

  • 제39권4호
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  • Pages.357-368
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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

Experimental research on the tensile properties of coal rocks in deep old goafs

  • Ning Jiang (College of Energy and Mining Engineering, Shandong University of Science and Technology) ;
  • Quanbao Su (College of Energy and Mining Engineering, Shandong University of Science and Technology) ;
  • Xia Jiang (Yuloka (Shandong) Mining Technology Co., Ltd.) ;
  • Zhiyou Gao (College of Energy and Mining Engineering, Shandong University of Science and Technology) ;
  • Qingbiao Guo (School of Spatial Informatics and geomatics Engineering, Anhui University of Sciences and Technology) ;
  • Shijie Song (College of Geology& Environment, Xi'an University of Science and Technology) ;
  • Tao Lyu (College of Energy and Mining Engineering, Shandong University of Science and Technology) ;
  • Ke Lyu (School of Mines, China University of Mining and Technology)
  • 투고 : 2024.03.26
  • 심사 : 2024.11.11
  • 발행 : 2024.11.25
⟨ 이전 논문 다음 논문 ⟩

초록

The pressurized water conditions of goafs weaken the support of remaining coal and rocks, which causes instability, failure, and sudden ground collapse. The impact of pressure-bearing water and CO2 on the tensile properties of residual coal pillars was explored in old goafs. Coal was analyzed using a pressure-water soaking device, electronic scanning microscope, and 3D full-field strain measurement system. Besides, Brazilian splitting tests were performed. The failure characteristics and energy evolution law of the macro-microscopic structure of coal specimens were analyzed under different soaking conditions-desiccation (DC), CO2 soaking (CS), water-CO2 soaking (WCS), and water soaking (WS). The peak stress of coal specimens and time to reach the peak decreased with varying soaking environments. Stress concentration initially occurred at the water end under the WCS condition, indicating that coal specimens deteriorated more under the pressure-bearing WCS condition compared with the CS condition. Fractures of coal specimens exhibited the highest development under the WS condition. Besides, dissolution was observed at the fractures of coal specimens, with severe failure to their internal microstructures. In conclusion, the instability failure of residual coal pillars is significant in studying the old goafs.

키워드

과제정보

This work was supported by National Natural Science Foundation of China(52374127); the Key supported project of the National Natural Science Foundation of China Regional Innovation and Development Joint Fund (U23A20600); Major Basic Research Project of Shandong Provincial Natural Science Foundation (ZR2024ZD22); Shandong Province Higher Educational Youth Innovation Science and Technology Support Program (2023KJ302).

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