Abstract
Rockburst mechanism has been a hot topic in the stability analysis of underground carven excavation, and the accurate description of energy evolution process is very critical to rockburst prediction. To study the evolution process of rockburst, such as V-shaped rockburst pit, theoretical formula derivation and numerical simulation are adopted to research the dynamic response characteristics during the formation process of rockburst pits quantitatively. The results show that rockburst intensity distribution varies with failure depth. It can be divided into three zone: slow-increase, rapid-increase and slow-decrease. For a circular tunnel with radius R, the strain energy release rate and vibration response of surrounding rock increases gradually within (0–0.06) R; reaches the peak value around (0.06–0.1) R and drops to a balance beyond 0.1R. Due to the same law of them, the rockburst risk can be conveniently predicted by monitoring vibration of surrounding rock with a certain depth. This work is beneficial to provide a good reference for rockburst prediction.
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Acknowledgments
The authors gratefully appreciate the supports from the National Natural Science Foundation of China (No. U1765109), the National Natural Science Foundation of China (51779192), National Key Research and Development Program of China (2016YFC0401802), and the Fundamental Research Funds for the Central Universities (2042018kf0211).
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Lu, A., Yan, P., Lu, W. et al. Numerical Simulation on Energy Concentration and Release Process of Strain Rockburst. KSCE J Civ Eng 25, 3835–3842 (2021). https://doi.org/10.1007/s12205-021-2037-y
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DOI: https://doi.org/10.1007/s12205-021-2037-y