a School of Mining and Coal, Inner Mongolia University of Science and Technology, Baotou, 014010, China
b College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
c School of Mining Engineering, Heilongjiang University of Science and Technology, Harbin, 150022, China
2024, 16(12): 5004-5026. doi:10.1016/j.jrmge.2024.01.004
Received: 2023-09-20 / Revised: 2023-12-02 / Accepted: 2024-01-20 / Available online: 2024-03-13
2024, 16(12): 5004-5026.
doi:10.1016/j.jrmge.2024.01.004
Received: 2023-09-20
Revised: 2023-12-02
Accepted: 2024-01-20
Available online: 2024-03-13
The natural property of rock material, whether impact occurs, is the key influencing factor of the occurrence of rock burst disaster. To accurately assess rock burst proneness, this study focuses on typical sandstone as the research object. Uniaxial cyclic loading and unloading tests were conducted to measure the elastic strain energy accumulated in sandstone under different stress levels and a relationship between elastic strain energy and stress level was established. The results show that: (1) The peak stress under cyclic loading and unloading conditions is slightly lower than the uniaxial compressive strength. With an increase in the number of cycles, the internal damage of sandstone continues to accumulate, and the mechanical properties such as compressive strength continue to deteriorate; (2) With an increase in stress, the input strain energy, elastic strain energy, and dissipated strain energy also increase; (3) When the stress is low, the increase in elastic strain energy is large and shows a steady growth; with an increase in stress, the increase of elastic strain energy decreases; (4) The square of stress at any time has a good linear relationship with elastic strain energy. According to the relationship obtained from the test, the elastic strain energy at the peak stress time can be obtained; (5) A new criterion for assessing rock burst proneness is proposed: residual energy release rate index WT, which characterizes the energy release per unit time when the rock burst occurs. The intervals for evaluating the rock burst proneness of the residual energy release rate index WT are as follows: WT <0.025, indicating no rock burst proneness; 0.025≤ WT <0.15, indicating weak rock burst proneness; 0.15≤ WT <2, indicating medium rock burst proneness; WT >2, indicating strong rock burst proneness; and (6) The rationality of the proposed residual energy release rate index WT is verified by the multi-index method and the multi-sample method, and the proposed residual energy release rate index is used to determine the rock burst proneness of 10 kinds of rock samples. The evaluation accuracy is shown to be high, and it can reflect the actual rock burst proneness
Keywords: Energy storage law, Rock burst proneness, Rock-burst criterion, Elastic strain energy, Residual energy release rate, Rationality verification
Guangbo Chen
Guangbo Chen obtained his PhD from Shandong University of Science and Technology, China, in 2019. He is the third level talent of Inner Mongolia's ‘321 Talent Project in the New Century’, a member of the Chinese Rock Mechanics and Engineering Society and the Inner Mongolia Young Scientists Innovation Alliance as well as an expert on the evaluation of the National Natural Science Foundation. He presided over a number of topics such as the National Natural Science Foundation. His research results have won one Third Prize of the China Rock Mechanics and Engineering Society Science and Technology Award, one Third Prize of the China Coal Industry Science and Technology Award, one First Prize of the 16th Inner Mongolia Autonomous Region Natural Science Academic Annual Conference Paper. He is mainly devoted to the study of rock mechanics and engineering, and has published more than 60 high level papers such as Journal of Rock Mechanics and Geotechnical Engineering (JRMGE), Chinese Journal of Rock Mechanics and Engineering, Journal of China Coal Society, Rock and soil mechanics and so on.