Geomechanics and Engineering

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Study on failure behaviors of mixed-mode cracks under static and dynamic loads

  • Zhou, Lei (Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Southwest University of Science and Technology) ;
  • Chen, Jianxing (Failure Mechanics & Engineering Disaster Prevention and Mitigation, Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University) ;
  • Zhou, Changlin (Chengdu Surveying Geotechnical Research Institute Co., Ltd. of MCC) ;
  • Zhu, Zheming (Failure Mechanics & Engineering Disaster Prevention and Mitigation, Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University) ;
  • Dong, Yuqing (Failure Mechanics & Engineering Disaster Prevention and Mitigation, Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University) ;
  • Wang, Hanbing (Failure Mechanics & Engineering Disaster Prevention and Mitigation, Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University)
  • Received : 2021.04.19
  • Accepted : 2022.04.27
  • Published : 2022.06.10
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Abstract

In the present study, a series of physical experiments and numerical simulations were conducted to investigate the effects of mode I and mixed-mode I/II cracks on the fracture modes and stability of roadway tunnel models. The experiments and simulations incorporated different inclination angle flaws under both static and dynamic loads. The quasi-static and dynamic testing were conducted by using an electro-hydraulic servo control device and drop weight impact system (DWIS), and the failure process was simulated by using rock failure process analysis (RFPA) and AUTODYN software. The stress intensity factor was also calculated to evaluate the stability of the flawed roadway tunnel models by using ABAQUS software. According to comparisons between the test and numerical results, it is observed that for flawed roadways with a single radical crack and inclination angle of 45°, the static and dynamic stability are the lowest relative to other angles of fractured rock masses. For mixed-mode I/II cracks in flawed roadway tunnel models under dynamic loading, a wing crack is produced and the pre-existing cracks increase the stress concentration factor in the right part of the specimen, but this factor will not be larger than the maximum principal stress region in the roadway tunnel models. Additionally, damage to the sidewalls will be involved in the flawed roadway tunnel models under static loads.

Keywords

Acknowledgement

This work was financially supported by the open fund of Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province (20kfgk01); the Sichuan Science and Technology Program(2021YJ0511); the State Key Laboratory for Geo-Mechanics and Deep Underground Engineering, China University of Mining &Technology (SKLGDUEK2111); the Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province (ZJRMG-2020-01); the Major research and development project of Metallurgical Corporation of China LTD. in the non-steel field (2021-05); the Fundamental Research Funds for the Central Universities(2021SCU12130); the Sichuan University postdoctoral interdisciplinary Innovation Fund.

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