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Failure precursor of surrounding rock mass around cross tunnel in high-steep rock slope

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Abstract

The stability of the surrounding rock mass around cross tunnel in the right bank slope of Dagangshan hydropower station, in the southwestern China, was analyzed by microseismic monitoring as well as numerical simulations. The realistic failure process analysis code (abbreviated as RFPA3D) was employed to reproduce the initiation, propagation, coalescence and interactions of micro-fractures, the evolution of associated stress fields and acoustic emission (AE) activities during the whole failure processes of the surrounding rock mass around cross tunnel. Combined with microseismic activities by microseismic monitoring on the right bank slope, the spatial-temporal evolution and the micro-fracture precursor characteristics during the complete process of progressive failure of the surrounding rock mass around cross tunnel were discussed and the energy release law of the surrounding rock mass around the cross tunnel was obtained. The result shows that the precursor characteristic of microfractures occurring in rock mass is an effective approach to early warn catastrophic damage of rock mass around cross tunnel. Moreover, the heterogeneity of rock mass is the source and internal cause of the failure precursor of rock mass.

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Authors and Affiliations

  1. Institute of Rock Instability and Seismicity Research, Faculty of Infrastruction Engineering, Dalian University of Technology, Dalian, 116024, China

    Ke Ma  (马克) & Chun-an Tang  (唐春安)

  2. State Key Laboratory of Coastal and Offshore Engineering (Dalian University of Technology), Dalian, 116024, China

    Ke Ma  (马克) & Chun-an Tang  (唐春安)

  3. State Key Laboratory of Hydraulics and mountain River Engineering (College of Water Resources and Hydropower, Sichuan University), Chengdu, 610065, China

    Nu-wen Xu  (徐奴文)

  4. HydroChina Chengdu Engineering Corporation, Chengdu, 610072, China

    Feng Liu  (刘峰)

  5. China Guodian Dadu River Dagangshan Hydropower Development Co., Ltd., Chengdu, 610072, China

    Jing-wu Xu  (徐敬武)

Authors
  1. Ke Ma  (马克)
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  2. Chun-an Tang  (唐春安)
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  3. Nu-wen Xu  (徐奴文)
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  4. Feng Liu  (刘峰)
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  5. Jing-wu Xu  (徐敬武)
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Corresponding author

Correspondence to Ke Ma  (马克).

Additional information

Foundation item: Projects(50820125405, 51004020, 51174039, 4112265) supported by the National Natural Science Foundation of China; Project (201104563) supported by the China Postdoctoral Science Foundation; Project(2011CB013503) supported by the National Basic Research Program of China; Project(51274053) supported by the Fundamental Research Funds for the Central Universities of China; Project(200960) supported by the Foundation for the Author of National Excellent Doctoral Dissertation of China: Project(NECT-09-0258) supported by the New Century Excellent Talents in University of China

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Ma, K., Tang, Ca., Xu, Nw. et al. Failure precursor of surrounding rock mass around cross tunnel in high-steep rock slope. J. Cent. South Univ. 20, 207–217 (2013). https://doi.org/10.1007/s11771-013-1478-y

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  • DOI: https://doi.org/10.1007/s11771-013-1478-y

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