Geomechanics and Engineering

  • 제30권4호
  • /
  • Pages.345-352
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  • 2022
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Stiffness effect of testing machine indenter on energy evolution of rock under uniaxial compression

  • Tan, Yunliang (State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology) ;
  • Ma, Qing (College of Energy and Mining Engineering, Shandong University of Science and Technology) ;
  • Wang, Cunwen (Shandong Energy Group) ;
  • Liu, Xuesheng (State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology)
  • 투고 : 2021.04.19
  • 심사 : 2022.07.23
  • 발행 : 2022.08.25
⟨ 이전 논문 다음 논문 ⟩

초록

When rock burst occurs, the damaged coal, rock and other fragments can be ejected to the roadway at a speed of up to 10 m/s. It is extremely harmful to personnel and mining equipment, and seriously affects the mining activities. In order to study the energy evolution characteristics, especially kinetic energy, in the process of rock mass failure, this paper first analyzes the energy changes of the rock in different stages under uniaxial compression. The formula of the kinetic energy of rock sample considering the energy from the indenter of the testing machine is obtained. Then, the uniaxial compression tests with different stiffness ratios of the indenter and rock sample are simulated by numerical simulation. The kinetic energy Ud, elastic strain energy Ue, friction energy Uf, total input energy U and surface energy Uθ of crack cracking are analyzed. The results show that: The stiffness ratio has influence on the peak strength, peak strain, Ud, Ue, Uθ, Uf and U of rock samples. The variation trends of strength, strain and energy with stiffness are different. And when the stiffness ratio increases to a certain value, if the stiffness of the indenter continues to increase, it will have no longer effect on the rock sample.

키워드

과제정보

This study was financially supported by Major Scientific and Technological Innovation Project of Shandong Provincial Key Research Development Program (Grant No. 2019SDZY02) and National Natural Science Foundation of China (Grant No. 52074168, No. 51874190).

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