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Investigations of Support Failure and Combined Support for Soft and Fractured Coal-Rock Tunnel in Tectonic Belt

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Abstract

The structural integrity of coal and rock tunnel affected by structural belts is generally poor, and the fracture development leads to the failure of support. Therefore, in this study, the tunnel deformation characteristics and deformation control technology were conducted using a combination of field investigation, laboratory experiment, theoretical analysis, field test, and other methods based on the Mukong coal mine. First, field investigations show that the main structural support failure often starts from some key parts associated with weak strengths, and the deformation is basically unevenly distributed. For this, the structural plane of tunnel rock mass was investigated and the internal structural deformation of the surrounding rocks was also monitored through the peepholes. In addition, point-load strength test was also conducted. Field observations and testing results show that rock fissures in the tunnel are well developed and a large loose circle will be formed after excavation. According to Barton Classification Q value and rock mass rating value, the mining tunnel stability falls into the category of Class V, i.e., the surrounding rock is poor or extremely poor. Finally, the support principles concerning surrounding rock stability control technology were proposed. The core idea is using support reinforcement repeatedly for several times until both internal and external load-bearing capacities of the surrounding rock are met. For the support reinforcement, a test with combined support scheme was conducted, including short bolts, long anchor cables, and U-steel brackets. Monitoring results of site application show that the proposed scheme contributes to the long-term stability of tunnel surrounding rock.

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Acknowledgements

This study was supported by National Natural Science Foundation of China (51574122, 51434006), the Open Research Foundation of Key Laboratory of Safety and High-efficiency Coal Mining, Ministry of Education (Anhui University of Science and Technology) (JYBSYS2015201). The supports are greatly appreciated.

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Authors and Affiliations

  1. Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines, Hunan University of Science and Technology, Xiangtan, 411201, Hunan, China

    Weijian Yu, Genshui Wu & Baifu An

  2. School of Resource and Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, 411201, Hunan, China

    Weijian Yu, Genshui Wu & Baifu An

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  1. Weijian Yu
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  2. Genshui Wu
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  3. Baifu An
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Correspondence to Weijian Yu.

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Yu, W., Wu, G. & An, B. Investigations of Support Failure and Combined Support for Soft and Fractured Coal-Rock Tunnel in Tectonic Belt. Geotech Geol Eng 36, 3911–3929 (2018). https://doi.org/10.1007/s10706-018-0582-z

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  • DOI: https://doi.org/10.1007/s10706-018-0582-z

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