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Geomechanics and Engineering
  Volume 20, Number 6, March25 2020, pages 517-525

Modeling time-dependent behavior of hard sandstone using the DEM method
Wen-Bin Guo, Bo Hu, Jian-Long Cheng and Bei-Fang Wang

    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.
Key Words
    hard sandstone; creep simulation; particle flow code; parallel bond model; Burger\'s model
Wen-Bin Guo: 1.) Inner Mongolia Key Laboratory of Mining Pressure and Strata Control, Hulunbeir University, Hulunbeir 021008, China
2.) College of Engineering and Technology, Hulunbeir University, Hulunbeir 021008, China

Bo Hu: 1.)Inner Mongolia Key Laboratory of Mining Pressure and Strata Control, Hulunbeir University, Hulunbeir 021008, China
2.) State Key Laboratory for Geomechanics and Deep Underground Engineering,
China University of Mining and Technology, Xuzhou 221116, China

Jian-Long Cheng: State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,
Chengdu University of Technology, Chengdu 610059, China

Bei-Fang Wang: State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, Beijing 100011, China

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