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22.11.2022 | Original Paper

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

verfasst von: Weijing Yao, Guangcheng Liu, Jianyong Pang, Xin Huang

Erschienen in: Geotechnical and Geological Engineering

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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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Metadaten
Titel
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
verfasst von
Weijing Yao
Guangcheng Liu
Jianyong Pang
Xin Huang
Publikationsdatum
22.11.2022
Verlag
Springer International Publishing
Erschienen in
Geotechnical and Geological Engineering
Print ISSN: 0960-3182
Elektronische ISSN: 1573-1529
DOI
https://doi.org/10.1007/s10706-022-02343-y