A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The Effect of Excavation Disturbance on Rockburst Trigger under Different Horizontal Geostress
Rockburst is one kind of dynamic geological disaster, and the influencing factors are complicated and diversified. Among which the high geostress is the major external cause, the hard brittle rock mass is the major internal cause, and excavation disturbance is the major incentive. The initial horizontal geostress in the surrounding rock significantly affects distribution of secondary stress after excavation, which is closely related to rockburst occurrences. Therefore, it is necessary to study the excavation disturbance on rockburst trigger under different horizontal geostress. To accomplish the research goal, the underground powerhouse at Pubugou hydropower station in Sichuan Province, China was taken as an example. The numerical model was set up to simulate the actual excavation steps and predict rockburst intensity based on stress criterion. The analysis indicated that the potential hazard of rockburst increased with the rise of horizontal geostress. When horizontal geostress was more dominant, rockburst usually happened on the roof and bottom of the cavern. When vertical geostress was more dominant, rockburst usually happened on the side wall of the cavern. Specially, when the ratio of horizontal geostress to vertical geostress was greater than 1.7, we should seriously pay attention to the effect of excavation disturbance on rockburst trigger and take proper measures to prevent and control rockburst.
The Effect of Excavation Disturbance on Rockburst Trigger under Different Horizontal Geostress
Rockburst is one kind of dynamic geological disaster, and the influencing factors are complicated and diversified. Among which the high geostress is the major external cause, the hard brittle rock mass is the major internal cause, and excavation disturbance is the major incentive. The initial horizontal geostress in the surrounding rock significantly affects distribution of secondary stress after excavation, which is closely related to rockburst occurrences. Therefore, it is necessary to study the excavation disturbance on rockburst trigger under different horizontal geostress. To accomplish the research goal, the underground powerhouse at Pubugou hydropower station in Sichuan Province, China was taken as an example. The numerical model was set up to simulate the actual excavation steps and predict rockburst intensity based on stress criterion. The analysis indicated that the potential hazard of rockburst increased with the rise of horizontal geostress. When horizontal geostress was more dominant, rockburst usually happened on the roof and bottom of the cavern. When vertical geostress was more dominant, rockburst usually happened on the side wall of the cavern. Specially, when the ratio of horizontal geostress to vertical geostress was greater than 1.7, we should seriously pay attention to the effect of excavation disturbance on rockburst trigger and take proper measures to prevent and control rockburst.
The Effect of Excavation Disturbance on Rockburst Trigger under Different Horizontal Geostress
Zhang, Ru (author) / Wu, Gang (author) / Gao, Ming-Zhong (author) / Wei, Jin-Bing (author) / Zhang, Yan-Fei (author)
Second International Conference on Geotechnical and Earthquake Engineering ; 2013 ; Chengdu, China
IACGE 2013 ; 213-222
2013-10-09
Conference paper
Electronic Resource
English
The Effect of Excavation Disturbance on Rockburst Trigger under Different Horizontal Geostress
| British Library Conference Proceedings | 2013
Rockburst synthetic criterions of high geostress area for Laxiwa powerstation underground caverns
| British Library Conference Proceedings | 1997
| Elsevier | 2024
| European Patent Office | 2024