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In situ experiments on width and evolution characteristics of excavation damaged zone in deeply buried tunnels

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Abstract

The seven long tunnels of Jinping II hydropower station are deeply buried. The width and evolution characteristics of excavation damaged zone (EDZ) are the key problem to the design of tunnels excavation and supports. In order to study this problem, several specific experimental tunnels with different overburden and geometric sizes were excavated at this site. Digital borehole camera, sliding micrometer, cross-hole acoustic wave equipment and acoustic emission apparatus were adopted. This paper introduced the comprehensive in situ experimental methods through pre-installed facilities and pre-drilled boreholes. Typical properties of the surrounding rock mass, including cracks, deformation, elastic wave and micro fractures, were measured during the whole process of the tunnel excavation. The width and characteristics of formation and evolution of tunnels EDZ were analyzed under different construction methods involving of TBM and drilling and blasting, the test tunnels were excavated by full-face or two benches. The relationships between EDZ and tunnel geometry sizes, overburden and excavation method were described as well. The results will not only contribute a great deal to the analysis of rock mass behavior in deeply buried rock mass, but also provide direct data for support design and rockburst prediction.

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Authors and Affiliations

  1. State Key Laboratory of Geomechanics and Geotechinical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China

    ShaoJun Li, XiaTing Feng, BingRui Chen & Quan Jiang

  2. Ertan Hydropower Development Company, Ltd., Chengdu, 610051, China

    ShiYong Wu, Bin Hu & JinSong Xu

  3. School of Resources and Civil Engineering, Northeastern University, Shenyang, 110004, China

    ZhanHai Li

Authors
  1. ShaoJun Li
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  2. XiaTing Feng
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  3. ZhanHai Li
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  4. BingRui Chen
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  5. Quan Jiang
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  6. ShiYong Wu
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  7. Bin Hu
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  8. JinSong Xu
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Correspondence to ShaoJun Li.

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Li, S., Feng, X., Li, Z. et al. In situ experiments on width and evolution characteristics of excavation damaged zone in deeply buried tunnels. Sci. China Technol. Sci. 54 (Suppl 1), 167–174 (2011). https://doi.org/10.1007/s11431-011-4637-0

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  • DOI: https://doi.org/10.1007/s11431-011-4637-0

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