Geomechanics and Engineering

Techno-Press (테크노프레스)
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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)
  • Received : 2019.10.14
  • Accepted : 2020.02.17
  • Published : 2020.03.25
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Abstract

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.

Keywords

Acknowledgement

Supported by : 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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