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Instability Mechanism and Surrounding Rock Control Technology of Roadway Subjected to Mining Dynamic Loading with Short Distance: A Case Study of the Gubei Coal Mine in China

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Abstract

The severe deformation of surrounding rock and the easy failure of the anchoring structure of roadway under large dynamic pressure influence in the short distance are the urgent issues to be paid more attention. Based on this problem, this paper is a case study on the instability mechanism and control technology of surrounding rock in the deep roadway under dynamic mining loading in the Gubei Coal Mine of China. The vertical distance from the − 575 m roadway of 11–2 mining area and mining working face is only 68 m. Firstly, the main factors influencing the surrounding rock’s severe deformation are determined by the analysis of site investigation, surrounding rock composition and structure, overlying strata failure measurement, and borehole camera detection. The stress distribution, displacement distribution, plastic zone, and lining stress distribution of roadway of three reinforcement schemes, including nine working conditions, were calculated by numerical simulation for ordinary bolt support, bolt-support + grouting of roof and two sides, and bolt-support + full section grouting. Then the combined support technology system of “36 U-shaped steel + bolt + anchor cable + grouting” was proposed. The field monitoring results showed that the deformation of two sides and roof were only 20 mm and 16 mm, respectively, during the 65 day monitoring period. Furthermore, the cracks in the surrounding rock are almost filled with grouting materials, and the overall stability of roadway surrounding rock was completely achieved. This successful case study demonstrated that the optimized supporting structure is reasonable and the deformation of surrounding rock has been effectively controlled.

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Data Availability

The datasets used and/or analyzed during the current study are available from the corresponding author or reasonable request.

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Acknowledgements

This work is supported by the Open Fund of Anhui Key Laboratory of Mining Construction Engineering, Anhui University of Science and Technology (No. GXZDSYS2022106), Key Project of Natural Science Research in Colleges and Universities in Anhui Province, China (No. KJ2020A0297), and Science and Technology Project of Huian City, China (No. 2021022).

Funding

The Funding was provided by Anhui Key Laboratory of Mining Construction Engineering, Anhui University of Science and Technology (Grant No. GXZDSYS2022106), University Natural Science Research Project of Anhui Province (Grant No. KJ2020A0297), Science and Technology Project of Huian City (Grant No. 2021022).

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Authors and Affiliations

  1. Anhui Key Laboratory of Mining Construction Engineering, Anhui University of Science and Technology, Huainan, 232001, Anhui Province, China

    Weijing Yao, Guangcheng Liu & Jianyong Pang

  2. School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan, 232201, Anhui Province, China

    Weijing Yao, Guangcheng Liu & Jianyong Pang

  3. State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Huainan, 232001, Anhui Province, China

    Weijing Yao, Guangcheng Liu & Jianyong Pang

  4. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, 22116, Jiangsu Province, China

    Xin Huang

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  1. Weijing Yao
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Correspondence to Weijing Yao.

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Yao, W., Liu, G., Pang, J. et al. Instability Mechanism and Surrounding Rock Control Technology of Roadway Subjected to Mining Dynamic Loading with Short Distance: A Case Study of the Gubei Coal Mine in China. Geotech Geol Eng 41, 1407–1427 (2023). https://doi.org/10.1007/s10706-022-02343-y

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