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Volume 39 Issue 12
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YU Yang, FENG Xia-ting, CHEN Bing-rui, XIAO Ya-xun, FENG Guang-liang. Fractal characteristics of micro-seismic volume for different types of immediate rock-bursts in deep tunnels[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(12): 2173-2179. DOI: 10.11779/CJGE201712004
Citation: YU Yang, FENG Xia-ting, CHEN Bing-rui, XIAO Ya-xun, FENG Guang-liang. Fractal characteristics of micro-seismic volume for different types of immediate rock-bursts in deep tunnels[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(12): 2173-2179. DOI: 10.11779/CJGE201712004
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Fractal characteristics of micro-seismic volume for different types of immediate rock-bursts in deep tunnels

  • 1. Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering, East China Jiao Tong University, Nanchang 330013, China;
    2. 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: September 13, 2016
  • Published Date: December 24, 2017
    Graphical Abstract
    • Abstract
  • A fractal method is put forward to study the self-similarity of the volume distribution of micro-seismic events during the development of different types of immediate rock-bursts. The proposed method is used to study the fractal behaviours of the volume distribution of micro-seismic events during the development of immediate rock-bursts that occur in four deep headrace tunnels and one drainage tunnel at the Jinping II Hydropower Station. The results indicate that the volume distribution of micro-seismic events during the evolution of immediate rock-bursts displays fractal properties. The fractal dimension of volume can be used as the basis for estimating rock-burst type, that is, the fractal dimensions of immediate strain rock-bursts are >0.7 and <1, but those of immediate strain-structure slip rock-bursts are >0.2 and <0.6. For the immediate strain rock-bursts and the immediate strain-structure slip rock-bursts, if the intensity is lower, the fractal dimensions of volume will be smaller. For the immediate strain-structure slip rock-bursts, the more the number of structure planes, the smaller the fractal dimensions of volume. These conclusions can be used as the guideline to develop a warning system and to reduce the risk of rock-bursts during construction of deep, hard-rock tunnels.
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    • References (20)
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