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Open AccessArticle

Rockburst Identification Method Based on Energy Storage Limit of Surrounding Rock

by Zhiqiang Zhang 1,2, Chun Luo 1,2, Heng Zhang 1,2,* and Ruikai Gong 1
1
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
2
Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China
*
Author to whom correspondence should be addressed.
Energies 2020, 13(2), 343; https://doi.org/10.3390/en13020343
Received: 11 October 2019 / Revised: 12 November 2019 / Accepted: 9 January 2020 / Published: 10 January 2020
(This article belongs to the Section Energy and Environment)
Rockbursts are one of the prominent problems faced by deep underground engineering. Not only do they affect the construction progress, but they also threaten the safety of construction personnel and equipment, and may even induce earthquakes. Therefore, the prediction of rockbursts has very important engineering significance for the excavation of deeply buried tunnels. In this paper, a new indicator for stability and optimization evaluation of hard, brittle surrounding rock under high geo-stresses, namely the minimum energy storage limit of surrounding rock induced by transient unloading, is proposed. In addition, the time for erecting support for tunnel excavation in the rockburst area and the impact of excavation dimensions on rockburst are investigated. The results show that transient unloading during the tunnel excavation process will reduce the energy storage limit of the rock mass. When the strain energy density of the local surrounding rock exceeds the minimum energy storage limit of the rock mass, the rock mass energy is suddenly released, and rockburst occurs. Rockburst is most likely to occur at 0.42–0.65 D away from the working face. The increasing length of a round adopted in high geo-stress areas will make the surrounding rock unstable and increase the probability of rockburst. View Full-Text
Keywords: deeply buried tunnel; rockburst; high geo-stress; energy storage limit; energy density; energy release rate deeply buried tunnel; rockburst; high geo-stress; energy storage limit; energy density; energy release rate
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Zhang, Z.; Luo, C.; Zhang, H.; Gong, R. Rockburst Identification Method Based on Energy Storage Limit of Surrounding Rock. Energies 2020, 13, 343.

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