Geomechanics and Engineering

  • 제20권6호
  • /
  • Pages.517-525
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  • 2020
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Modeling time-dependent behavior of hard sandstone using the DEM method

  • Guo, Wen-Bin (Inner Mongolia Key Laboratory of Mining Pressure and Strata Control, Hulunbeir University) ;
  • Hu, Bo (Inner Mongolia Key Laboratory of Mining Pressure and Strata Control, Hulunbeir University) ;
  • Cheng, Jian-Long (State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology) ;
  • Wang, Bei-Fang (State Key Laboratory of Water Resource Protection and Utilization in Coal Mining)
  • 투고 : 2019.10.14
  • 심사 : 2020.02.17
  • 발행 : 2020.03.25
⟨ 이전 논문 다음 논문 ⟩

초록

The long-term stability of rock engineering is significantly affected by the time-dependent deformation behavior of rock, which is an important mechanical property of rock for engineering design. Although the hard rocks show small creep deformation, it cannot be ignored under high-stress condition during deep excavation. The inner mechanism of creep is complicated, therefore, it is necessary to investigate the relationship between microscopic creep mechanism and the macro creep behavior of rock. Microscopic numerical modeling of sandstone creep was performed in the investigation. A numerical sandstone sample was generated and Parallel Bond contact and Burger's contact model were assigned to the contacts between particles in DEM simulation. Sensitivity analysis of the microscopic creep parameters was conducted to explore how microscopic parameters affect the macroscopic creep deformation. The results show that the microscopic creep parameters have linear correlations with the corresponding macroscopic creep parameters, whereas the friction coefficient shows power function with peak strength and Young's modulus, respectively. Moreover, the microscopic parameters were calibrated. The creep modeling curve is in good agreement with the verification test result. Finally, the creep curves under one-step loading and multi-step loading were compared. This investigation can act as a helpful reference for modeling rock creep behavior from a microscopic mechanism perspective.

키워드

과제정보

연구 과제 주관 기관 : Inner Mongolia Universities

This work is finically supported by the Open Fund of State Key Laboratory of Water Resource Protection and Utilization in Coal Mining (Grant No. SHJT-17-42.7), and Key Scientific Research Project of Inner Mongolia Universities (NJZZ20300).

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피인용 문헌

  1. Long-term behavior of earth pressure around a high-filled cut-and-cover tunnel vol.26, pp.4, 2020, https://doi.org/10.12989/gae.2021.26.4.311
  2. Burger’s Bonded Model for Distinct Element Simulation of the Multi-Factor Full Creep Process of Soft Rock vol.9, pp.9, 2020, https://doi.org/10.3390/jmse9090945