Rockburst Identification Method Based on Energy Storage Limit of Surrounding Rock
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 importan...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-01-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/13/2/343 |
| _version_ | 1811305165345521664 |
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| author | Zhiqiang Zhang Chun Luo Heng Zhang Ruikai Gong |
| author_facet | Zhiqiang Zhang Chun Luo Heng Zhang Ruikai Gong |
| author_sort | Zhiqiang Zhang |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-13T08:20:31Z |
| format | Article |
| id | doaj.art-d254302893e94bfaab9d51b57d886ef4 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-13T08:20:31Z |
| publishDate | 2020-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-d254302893e94bfaab9d51b57d886ef42022-12-22T02:54:40ZengMDPI AGEnergies1996-10732020-01-0113234310.3390/en13020343en13020343Rockburst Identification Method Based on Energy Storage Limit of Surrounding RockZhiqiang Zhang0Chun Luo1Heng Zhang2Ruikai Gong3School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, ChinaSchool of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, ChinaSchool of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, ChinaSchool of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, ChinaRockbursts 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.https://www.mdpi.com/1996-1073/13/2/343deeply buried tunnelrockbursthigh geo-stressenergy storage limitenergy densityenergy release rate |
| spellingShingle | Zhiqiang Zhang Chun Luo Heng Zhang Ruikai Gong Rockburst Identification Method Based on Energy Storage Limit of Surrounding Rock Energies deeply buried tunnel rockburst high geo-stress energy storage limit energy density energy release rate |
| title | Rockburst Identification Method Based on Energy Storage Limit of Surrounding Rock |
| title_full | Rockburst Identification Method Based on Energy Storage Limit of Surrounding Rock |
| title_fullStr | Rockburst Identification Method Based on Energy Storage Limit of Surrounding Rock |
| title_full_unstemmed | Rockburst Identification Method Based on Energy Storage Limit of Surrounding Rock |
| title_short | Rockburst Identification Method Based on Energy Storage Limit of Surrounding Rock |
| title_sort | rockburst identification method based on energy storage limit of surrounding rock |
| topic | deeply buried tunnel rockburst high geo-stress energy storage limit energy density energy release rate |
| url | https://www.mdpi.com/1996-1073/13/2/343 |
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