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Dynamic Loading Mechanism and Stability Control of Gob-Side Entry Retaining with Thick and Hard Roof: Insights from Numerical Simulation and Field Test

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Abstract

The retained roadway subjected to dynamic loading from thick and hard roof (THF) fracturing caused severe deformations in the thick coal seam (TCS). Understanding the dynamic loading mechanism of gob-side entry retaining (GER) in TCS with THF is the first step in determining the stability of the retained roadway. Characteristics of dynamic loading mechanism of gob-side entry retaining (GER) in TCS with THF are investigated through numerical simulation and field test of 150208 haulage gate in Sucun coal mine. To improve the reliability of numerical simulation, the double-yield model is used to simulate gob and the strain-softening model is used to simulate filling body; the dynamic module in FLAC3D is used to simulate the dynamic loading due to the THF fracture, and the global model are validated. Characteristics of surrounding rock convergence, plastic zone distribution, and vertical stress in the filling body after the THF fracture are reveled with respect to width to height ratio (W/H) of the filling body and the dynamic loading strength of the THF. The rational width to height ration of the filling body constructed with high-water materials is 0.57. Field monitoring results show that the GER with THF in Sucun coal mine could adapt the dynamic loading due to the THF fracture and meet the requirement. This study is helpful to better study the stability of GER according to the breaking dynamic load of THF and provides reference and guidance for the analysis of breaking dynamic load of THF under similar geological conditions.

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Acknowledgements

The project was supported by Key Research and Development Special Tasks of Xinjiang Province (No. 2022B01051), Key projects of the Joint Fund of the National Natural Science Foundation of China (No. U21A20107), the Scientific Research Fund of Hunan Provincial Education Department (No.21B0495), and the Postgraduate Scientific Research Innovation Project of Hunan Province (No. CX20221049).

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Authors and Affiliations

  1. Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Goal Mines, Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines, Hunan University of Science and Technology, Hunan University of Science and Technology, Xiangtan, 411201, China

    Zizheng Zhang, Shiqiang Xu, Weijian Yu, Jinlin Xin & Hai Wu

  2. School of Mines, China University of Mining and Technology, Xuzhou, 221116, China

    Jianbiao Bai & Shuai Yan

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  1. Zizheng Zhang
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Contributions

Zizheng Zhang wrote all the sections of the paper. Shiqiang Xu and Jinlin Xu carried out the numerical simulations. Weijian Yu and Hai Wu revised the paper. Jianbiao Bai and Shuai Yan carried out the field test and field monitoring.

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Correspondence to Zizheng Zhang.

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Zhang, Z., Xu, S., Yu, W. et al. Dynamic Loading Mechanism and Stability Control of Gob-Side Entry Retaining with Thick and Hard Roof: Insights from Numerical Simulation and Field Test. Mining, Metallurgy & Exploration 40, 703–717 (2023). https://doi.org/10.1007/s42461-023-00739-9

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