Journal
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
Volume 72, Issue 2, Pages 237-247Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s10064-013-0470-y
Keywords
Deep tunnel; Hard rock; Rockburst; Brittle failure; FAI; LERR
Funding
- National Science Foundation of China [51079144, 2010CB732006, 50979104]
- Ertan Hydropower Development Company Ltd.
- Important Pilot Project for Youth Talent of Knowledge Innovation Project of the Chinese Academy of Sciences (CAS) [KZCX2-EW-QN115]
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Two extremely intense rockbursts took place during the excavation of the drainage tunnel and headrace tunnel No. 4 at the Jinping II hydropower station in southwestern China. The geological conditions, damage, and failure of the surrounding rock mass at the sections where the rockbursts occurred were surveyed and are described here with a focus on the development of the damage to the rock mass and the mechanism by which it occurred. The numerical method based on the Cohesion Weakening and Friction Strengthening model and various indices, including the failure approaching index and the local energy release rate, were adapted for these purposes. The results shown here may help us understand the generation and process of development of rockbursts and evaluate the degree of failure in the rockmass. This information may be valuable in the study and design of rockburst-resistant measures in deep tunnels.
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