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| Simulation test study on rock burst characteristics of circular chamber under loading rate effect |
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Received:August 03, 2018
Revised:April 09, 2019
Accepted:August 21, 2018
Published Online:August 26, 2019
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| DOI： |
| KeyWord:Rock burst; loading rate; acoustic emission; circular chamber |
| Author | Institution |
| Hufan |
Kunming University of Science and Technology Land and Resources Engineering College |
| Chenjunzhi |
Kunming University of Science and Technology Land and Resources Engineering College |
| Lichunyi |
Kunming University of Science and Technology Land and Resources Engineering College |
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| Abstract: |
| In this paper, the RLW-3000 servo rock mechanics test system is used to study the rockburst process of circular chamber under deep high stress. By studying the characteristics of acoustic emission timing under different loading rate, combined with its mechanical properties and macroscopic phenomena. The results show that with the increase of loading rate, the load of cuttings begins to show a significant decrease, and the time when the cuttings begin to ejection is obviously ahead of time. The start time of rockburst on both sides of the circular chamber is simulated, There is a significant difference in the severity of the stress, which may be caused by the change of the stress concentration position of the specimen. The reason for the change of the stress concentration position may be the discretization of the specimen, the eccentricity of the loading, etc., which still need further test to verify; the loading rate will affect Rock burst time, severity. The greater the rate of rock burst the shorter the breeding time, while the rock burst is also more intense, and the rock burst when the sound ringing count rate, the cumulative ringing count, the rate, the cumulative energy steep point in advance, the greater the maximum. The research contents are of great significance to study the effect of loading rate in rockburst process, and provide some reference for the prevention of rockburst. |
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