Geomechanics and Engineering

  • 제22권2호
  • /
  • Pages.187-196
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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

Waveform characterization and energy dissipation of stress wave in sandstone based on modified SHPB tests

  • Cheng, Yun (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Song, Zhanping (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Jin, Jiefang (School of Architectural and Surveying Engineering, Jiangxi University of Science and Technology) ;
  • Wang, Tong (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Yang, Tengtian (Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering)
  • 투고 : 2019.03.29
  • 심사 : 2020.06.22
  • 발행 : 2020.07.25
⟨ 이전 논문 다음 논문 ⟩

초록

The changeable stress environment directly affect the propagation law of a stress wave. Stress wave propagation tests in sandstone with different axial stresses were carried using a modified split Hopkinson Pressure bar (SHPB) assuming the sandstone has a uniform pore distribution. Then the waveform and stress wave energy dissipation were analyzed. The results show that the stress wave exhibits the double peak phenomenon. With increasing axial stress, the intensity difference decreases exponentially and experiences first a dramatic decrease and then gentle development. The demarcation stress is σ/σc=30%, indicating that the closer to the incident end, the faster the intensity difference attenuates. Under the same axial stress, the intensity difference decreases linearly with propagation distance and its attenuation intensity factor displays a quadratic function with axial stress. With increasing propagation distance, the time difference decays linearly and its delay coefficient reflects the damage degree. The stress wave energy attenuates exponentially with propagation distance, and the relations between attenuation rate, attenuation coefficient and axial stress can be represented by the quadratic function.

키워드

과제정보

The authors would like to thank the Natural Science Basic Research Program of Shaanxi (2019JQ-762), Project funded by China Postdoctoral Science Foundation (2018M643809XB). Project Foundation of Department of Housing and Urban Rural Development of Shaanxi Province (2019-K39). We also thank LetPub (www.letpub.com) for its linguistic assistance during the preparation of this manuscript.

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