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Rock Mechanics and Rock Engineering

, Volume 49, Issue 3, pp 981–1000 | Cite as

Microseismic Monitoring of Strainburst Activities in Deep Tunnels at the Jinping II Hydropower Station, China

  • N. W. Xu
  • T. B. Li
  • F. Dai
  • R. Zhang
  • C. A. Tang
  • L. X. Tang
Original Paper

Abstract

Rockbursts were frequently encountered during the construction of deep tunnels at the Jinping II hydropower station, Southwest China. Investigations of the possibility of rockbursts during tunnel boring machine (TBM) and drilling and blasting (D&B) advancement are necessary to guide the construction of tunnels and to protect personnel and TBM equipment from strainburst-related accidents. A real-time, movable microseismic monitoring system was installed to forecast strainburst locations ahead of the tunnel faces. The spatiotemporal distribution evolution of microseismic events prior to and during strainbursts was recorded and analysed. The concentration of microseismic events prior to the occurrence of strainbursts was found to be a significant precursor to strainbursts in deep rock tunnelling. During a 2-year microseismic investigation of strainbursts in the deep tunnels at the Jinping II hydropower station, a total of 2240 strainburst location forecasts were issued, with 63 % correctly forecasting the locations of strainbursts. The successful forecasting of strainburst locations proved that microseismic monitoring is essential for the assessment and mitigation of strainburst hazards, and can be used to minimise damage to equipment and personnel. The results of the current study may be valuable for the construction management and safety assessment of similar underground rock structures under high in situ stress.

Keywords

Deep tunnel Strainburst Microseismic monitoring Jinping II hydropower station Forecasting 

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (no. 51374149), National Basic Research Program of China (no. 2011CB013503), National Natural Science Foundation of China (no. 51209127) and opening fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology) (no. SKLGP2013K013). Feng Dai acknowledges the financial support of the Program for New Century Excellent Talents in University (NCET-13-0382). Thanks are given to colleagues at the Jinping II project for their valuable contributions to the project. We thank both the anonymous reviewers for their constructive comments devoted to improving the quality of our manuscript.

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Copyright information

© Springer-Verlag Wien 2015

Authors and Affiliations

  • N. W. Xu
    • 1
    • 2
  • T. B. Li
    • 2
  • F. Dai
    • 1
  • R. Zhang
    • 1
  • C. A. Tang
    • 3
  • L. X. Tang
    • 4
  1. 1.State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and HydropowerSichuan UniversityChengduPeople’s Republic of China
  2. 2.State Key Laboratory of Geo-Hazard Prevention and Geo-Environment ProtectionChengdu University of TechnologyChengduPeople’s Republic of China
  3. 3.College of Civil EngineeringDalian University of TechnologyDalianPeople’s Republic of China
  4. 4.School of Mining EngineeringUniversity of Science and Technology LiaoningAnshanPeople’s Republic of China

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