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Volume 39 Issue 7
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Abstract
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ZHAO Zhou-neng, FENG Xia-ting, CHEN Bin-rui. Activity laws of microseisms and rockbursts in deep tunnels by TBM tunneling[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(7): 1206-1215. DOI: 10.11779/CJGE201707006
Citation: ZHAO Zhou-neng, FENG Xia-ting, CHEN Bin-rui. Activity laws of microseisms and rockbursts in deep tunnels by TBM tunneling[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(7): 1206-1215. DOI: 10.11779/CJGE201707006
shu

Activity laws of microseisms and rockbursts in deep tunnels by TBM tunneling

  • 1. School of Environmental Engineering and Resources, Southwest University of Science and Technology, Mianyang 621010, China;
    2. Northeastern University, Shenyang 110004, China;
    3. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China

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  • Received Date: March 24, 2016
  • Published Date: July 24, 2017
    Graphical Abstract
    • Abstract
  • For the deep tunnel of JinpingⅡ Hydropower Station excavated by TBM, based on the seismic monitoring data and rockbursts, the temporal and spatial distribution characteristics of microseismic events and rockbursts and evolution laws of microseismicity information during the preparation process of rockbursts are studied. The conclusions are drawn as follows: (1) The active period of microseisms and the peak period of rockbursts are the working time and within one hour after stopping working for TBM. The microseismic activity mainly ranges from 3 times the tunnel diameter behind working face to 0.4 times ahead, and its peak value is located at 0.8 times the tunnel diameter behind working face. The rockbursts mainly occur within the region 2 times the tunnel diameter behind working face, especially the high-risk zone of rockbursts lies in the region as large as 1 times the tunnel diameter behind working face. Therefore, there is certain space-time relativity between the microseisms and the rockbursts. (2) A sudden increase of microseismic released energy or the steep rise of cumulated apparent volume (CAV) with a sharp drop of Schmidt number in the time sequence is an microseismic anomaly, which is a premonition of rockbursts. (3) The spatial distribution pattern of mircroseismic events shows a transformation from random to clump distribution in certain zone with time, and the degree of their clump dispersion pattern gradually increases, simultaneously accompanied by a growing number of microseismic events with large magnitude and high energy, that is, it is an microseismic anomaly and also a premonition of rockbursts.
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    • References (29)
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