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| Numerical simulation of stress-structural rockburst based on GDEM software |
| MA Chunchi1,2, CHEN Kezhu3, LI Tianbin1,2*, ZENG Jun1,2, MA Jiaji1,2
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1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, Sichuan, China;
2. College of Environment and Civil Engineering, Chengdu University of Technology, Chengdu 610059, Sichuan, China;
3. Sichuan Communication Surveying Design Institute Co., Ltd., Chengdu 610017, Sichuan, China |
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Abstract With the start of a series of major underground projects in western China, more and more rockburst disasters bring serious harm to the safety of construction personnel and machinery. However, rockburst has complex failure types and fracture surface characteristics in the specific geological structure. Therefore, a correct understanding of the characteristics of rockburst failure process has become an urgent problem to be solved. GDEM software was used to simulate and reproduce three typical stress-structure rockburst, and the rockburst gestation process, rockburst block movement characteristics and rockburst system energy characteristics were discussed. The study showed that there were great differences in the failure form and energy evolution of bending-bulging, cracking-sliping and splitting-dumping rockburst under different rock mass structures. In addition, the numerical simulation directly showed that the rock burst would not only produce block ejection phenomenon, but also lead to rock mass damage and fragmentation in a certain depth of the rockburst pit. The research results can provide some reference basis for the gestation mechanism of stress-structure rockburst, as well as the macroscopic understanding of rockburst failure phenomenon and the design of rockburst protection measures in construction.
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Received: 02 July 2020
Published: 20 September 2020
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