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Numerical Simulation of Squeezing Failure in a Coal Mine Roadway due to Mining-Induced Stresses

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Abstract

Squeezing failure is a common failure mechanism experienced in underground coal mine roadways due mainly to mining-induced stresses, which are much higher than the strength of rock mass surrounding an entry. In this study, numerical simulation was carried out to investigate the mechanisms of roadway squeezing using a novel UDEC Trigon approach. A numerical roadway model was created based on a case study at the Zhangcun coal mine in China. Coal extraction using the longwall mining method was simulated in the model with calculation of the mining-induced stresses. The process of roadway squeezing under severe mining-induced stresses was realistically captured in the model. Deformation phenomena observed in field, including roof sag, wall convexity and failed rock bolts are realistically produced in the UDEC Trigon model.

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Acknowledgments

We thank Dr. Yongzheng Wu in China Coal Research Institute for providing further field data for calibrating the UDEC models.

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Authors and Affiliations

  1. Engineering Geology and Resource Geotechnics Group, Simon Fraser University, Burnaby, BC, Canada

    Fuqiang Gao & Doug Stead

  2. National Key Laboratory of Coal Mining and Clean Utilization (China Coal Research Institute), Beijing, China

    Fuqiang Gao & Hongpu Kang

Authors
  1. Fuqiang Gao
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  2. Doug Stead
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  3. Hongpu Kang
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Correspondence to Fuqiang Gao.

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Gao, F., Stead, D. & Kang, H. Numerical Simulation of Squeezing Failure in a Coal Mine Roadway due to Mining-Induced Stresses. Rock Mech Rock Eng 48, 1635–1645 (2015). https://doi.org/10.1007/s00603-014-0653-2

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  • DOI: https://doi.org/10.1007/s00603-014-0653-2

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