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Strainburst characteristics under bolt support conditions: an experimental study

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Abstract

Strainburst, defined as a burst that occurs on the periphery of tunnels, is always associated with intact and hard brittle rocks and high geo-stress. In practical engineering, the prevention of strainburst by bolting does not achieve the desired effects. Deep insight into the strainburst process and mechanisms under bolt support conditions is necessary to ensure safe underground construction. In this study, strainburst characteristics under bolt support conditions were investigated using a true-triaxial rockburst testing system, which was equipped with an acoustic emission monitoring system. High-speed cameras were also used to capture the ejection failure process. Two indicators, namely kinetic energy and maximum decibel, were used to comprehensively evaluate the rockburst intensity. In addition, characteristic stresses, failure mode and cracking mechanisms under different bolt spacing conditions were investigated. The test results demonstrated that rockburst is greatly affected by the bolt arrangement. Rockburst changes from the way occurring in the form of a local failure in weak area to the way striking the bolt position and even the overall free face with the decrease in bolt spacing. The use of the bolt increases the rockburst intensity, but the intensity decreases as the bolt spacing decreases. Characteristic stresses including crack initiation stress, crack damage stress and peak strength increase monotonously with the use of bolt and the decreasing bolt spacing. During the strainburst, tensile failure dominates the cracking process regardless of bolt spacing; however, with the use of bolt and decrease in bolt spacing, tensile splitting near the free face become less obvious and the proportion of shear failure gradually increased.

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Acknowledgements

The authors would like to thank for the support from the National Natural Science Foundation of China under Grant No. 41472329. The work in this paper was also supported by the Opening Fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology) under Grant No. SKLGP2017K022, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences under Grant No. Z016009, the Guangxi Natural Science Foundation under Grant No. 2016GXNSFGA380008 and the Innovation Project of Guangxi Graduate Education under Grant No. YCBZ2018025.

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Authors and Affiliations

  1. Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, School of Civil and Architecture Engineering, Guangxi University, Nanning, 530004, People’s Republic of China

    Xiaochuan Hu, Guoshao Su & Kang Chen

  2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu, 610059, People’s Republic of China

    Guoshao Su & Tianbin Li

  3. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, People’s Republic of China

    Guoshao Su & Quan Jiang

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  1. Xiaochuan Hu
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  2. Guoshao Su
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  3. Kang Chen
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  4. Tianbin Li
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  5. Quan Jiang
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Correspondence to Guoshao Su.

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Hu, X., Su, G., Chen, K. et al. Strainburst characteristics under bolt support conditions: an experimental study. Nat Hazards 97, 913–933 (2019). https://doi.org/10.1007/s11069-019-03682-5

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