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

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• 作者：N. W. Xu ; T. B. Li ; F. Dai ; R. Zhang ; C. A. Tang…
• 关键词：Deep tunnel ; Strainburst ; Microseismic monitoring ; Jinping II hydropower station ; Forecasting
• 刊名：Rock Mechanics and Rock Engineering
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：49
• 期：3
• 页码：981-1000
• 全文大小：7,091 KB
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• 作者单位：N. W. Xu (1) (2)
  T. B. Li (2)
  F. Dai (1)
  R. Zhang (1)
  C. A. Tang (3)
  L. X. Tang (4)
  
  1. State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, 610065, Sichuan, People’s Republic of China
  2. State Key Laboratory of Geo-Hazard Prevention and Geo-Environment Protection, Chengdu University of Technology, Chengdu, 610059, Sichuan, People’s Republic of China
  3. College of Civil Engineering, Dalian University of Technology, Dalian, 116024, Liaoning, People’s Republic of China
  4. School of Mining Engineering, University of Science and Technology Liaoning, Anshan, 114051, Liaoning, People’s Republic of China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geophysics and Geodesy
  Civil Engineering
  
• 出版者：Springer Wien
• ISSN：1434-453X

文摘

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.