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Geomechanics and Engineering
  Volume 30, Number 4, August25 2022 , pages 345-352
DOI: https://doi.org/10.12989/gae.2022.30.4.345
 


Stiffness effect of testing machine indenter on energy evolution of rock under uniaxial compression
Yunliang Tan, Qing Ma, Cunwen Wang and Xuesheng Liu

 
Abstract
    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 Uo of crack cracking are analyzed. The results show that: The stiffness ratio has influence on the peak strength, peak strain, Ud, Ue, Uo, 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.
 
Key Words
    kinetic energy; rock burst; stiffness; testing machine; uniaxial compression
 
Address
Yunliang Tan: State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Qingdao 266590, China; College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, 266590, China; Shandong Energy Group, Jinan 250014, China
Qing Ma: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
Cunwen Wang: Shandong Energy Group, Jinan 250014, China
Xuesheng Liu: State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Qingdao 266590, China; College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
 

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