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Study on Energy Release of Surrounding Rock under the Multiple Unloading Disturbance during Tunnel Excavation
Joint Authors
Fan, Yong
Zheng, Junwei
Hu, Xinyi
Cui, Xianze
He, Weiping
Source
Mathematical Problems in Engineering
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-14, 14 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-08-26
Country of Publication
Egypt
No. of Pages
14
Main Subjects
Abstract EN
During excavation of deep rock, the release of strain energy plays an important role in geologic hazards caused by excavation.
However, in the previous studies, the influence of transient unloading of in situ stress caused by blasting excavation has been ignored, and the blasting excavation of a tunnel is regarded as a single blast process.
In this paper, the dynamic adjustment process of strain energy and the energy storage limit of surrounding rocks caused by transient unloading of in situ stress under elastic conditions were firstly analyzed.
Then, the brittle-ductile-plastic transition model based on the Hoek–Brown strength criterion was simulated in FLAC3D.
Finally, the dynamic release process of strain energy of surrounding rocks caused by multiple unloading disturbances was analyzed during the excavation of 2# Underground Laboratory of Jinping II Hydropower Station employing the newly proposed index, energy release coefficient (ERC).
Results show that the strain energy of surrounding rock masses firstly decreases, then increases, next reduces, and finally stabilizes under the transient unloading of in situ stress.
In the process of dynamic change of strain energy, when the strain energy exceeds its storage limit, a large amount of strain energy will be released and thus will lead to damage of the surrounding rock masses.
Because the cut holes and the first circle of breaking holes are far away from the final excavation boundary, the unloading disturbance to the strain energy of surrounding rock masses is small.
Furthermore, the energy release of surrounding rock masses is mainly caused by the unloading of the last circle of breaking holes and perimeter holes, and the closer to the final excavation boundary, the more intense the energy release.
American Psychological Association (APA)
Fan, Yong& Zheng, Junwei& Hu, Xinyi& Cui, Xianze& He, Weiping. 2020. Study on Energy Release of Surrounding Rock under the Multiple Unloading Disturbance during Tunnel Excavation. Mathematical Problems in Engineering،Vol. 2020, no. 2020, pp.1-14.
https://search.emarefa.net/detail/BIM-1196806
Modern Language Association (MLA)
Fan, Yong…[et al.]. Study on Energy Release of Surrounding Rock under the Multiple Unloading Disturbance during Tunnel Excavation. Mathematical Problems in Engineering No. 2020 (2020), pp.1-14.
https://search.emarefa.net/detail/BIM-1196806
American Medical Association (AMA)
Fan, Yong& Zheng, Junwei& Hu, Xinyi& Cui, Xianze& He, Weiping. Study on Energy Release of Surrounding Rock under the Multiple Unloading Disturbance during Tunnel Excavation. Mathematical Problems in Engineering. 2020. Vol. 2020, no. 2020, pp.1-14.
https://search.emarefa.net/detail/BIM-1196806
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1196806