Rock and Soil Mechanics ›› 2019, Vol. 40 ›› Issue (7): 2847-2854.doi: 10.16285/j.rsm.2018.0470

• Geotechnical Engineering • Previous Articles     Next Articles

Characteristics of rockburst location deflection and its microseismic activities in a deep tunnel

LI Tong1, 2, FENG Xia-ting1, 3, WANG Rui4, XIAO Ya-xun1, WANG Yong4, FENG Guang-liang1, YAO Zhi-bin3, NIU Wen-jing3   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang, Liaoning 110819, China; 4. Lhasa-Nyingchi Railway Construction Headquarters of China Railway, Xining, Qinghai 810007, China
  • Received:2018-03-28 Online:2019-07-11 Published:2019-07-28
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51621006, 41320104005, 51509244) and the Science and Technology Development Project of China Railway (2017G006-B).

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Abstract: The Bayu tunnel is a controlled project in Nyingchi-Lhasa section of the Sichuan-Tibet railway. Rockbursts happen frequently, and rockburst locations are different in adjacent areas during the construction process. By using the microseismic monitoring system, the evolution laws of rock mass fracture were observed in situ during the process of rockburst location deflection. In addition, the reasons for the deflection of the rockburst locations were discussed. The results showed that the microseismic information was distributed unevenly on both sides of rockburst location deflection. Meanwhile, all the microseismic activities (the number of events, energy and apparent volume) deflected with the deflection of rockburst location, which indicates that they have an obvious spatial correlation. The evolution laws of apparent stress and excavation damaged zones of rock mass in the deflection location reveal that the deflection of rockburst location is related to the change of local stress concentration area, and the rockburst more easily occurs in the area with larger stress concentration. The results provide significant references for the warning and prevention of the deflection of the rockburst locations.

Key words: deep-buried tunnel, the Sichuan-Tibet railway, rockburst, microseismic monitoring, deflect, stress concentration area

CLC Number: 

  • TU 459
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