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Study on the formation of gangue wall and the stress distribution of surrounding rock in gob side entry with roof cutting

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Abstract

To study the formation mechanism of gangue wall and the stress distribution of surrounding rock in gob-side entry with roof cutting at different inclination angles, with the background of 011,810 working face in Jinfeng Coal Mine as the background, the formation mechanism and definition method of roof cutting influence zone were proposed and the stope partition was determined during the roof cutting by means of theoretical analysis and numerical simulation. The UDEC numerical simulation software was used to carry out the numerical simulation of roof cutting and forming roadways at 4 different inclination angle coal seams of 0°, 15°, 30°, and 45°. The results show that during gob-side entry retaining by roof cutting, the influence area of roof cutting increases gradually with the increase of coal seam dip angle. The reason is the caving gangue in the goaf slips downward with the increase of coal seam dip angle, which forms support for the goaf roof, and increases the fracturing step of the goaf roof. And during gob-side entry retaining at head entry, the gangue wall will change from the two-way force to the three-way force as the coal seam dip angle increases. As the force state changes, the overburden pressure is one of the main factors affecting the lateral pressure of the gangue wall. As the coal seam inclination increases, the collapsed gangue piles up and compacts under the support of the gear lever, and the stress of the gangue wall increases from 2 to 27 MP; the stress concentration of the solid coal gang along the gob-side entry moves deeper. The research shows that when the coal seam dip angle is greater than a certain angle, the collapsed gangue slides down the groove along the goaf, increasing the difficulty of blocking gangue support along the empty roadway, but due to the timely topping of the gangue, the dynamic pressure zone along the empty roadway has been reduced, and the stability of the roadway surrounding rock has been improved. The research on the formation mechanism of gangue wall and the stress distribution law of the gob-side entry surrounding rock in different inclination angle coal seams has laid a theoretical foundation for the optimization and extensive popularization and application of the technology of gob-side entry retaining by roof cutting and pressure relief, which has important scientific value.

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Acknowledgements

Thanks to all the people who contributed to the research and the manuscript. Finally, I would like to express my heartfelt thanks to the language editors from Elsevier for editing my manuscript language.

Funding

This work was supported by the National Natural Science Foundation of China (Grant Nos. 51904188, 41702381) and the Open Fund of State Key Laboratory for GeoMechanics and Deep Underground Engineering (SKLGDUEK1821) and Zhejiang Collaborative Innovation Center for Prevention and Control of Mountain Geologic Hazards (PCMGH-2016-Z-02).

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Authors and Affiliations

  1. School of Civil Engineering, Shaoxing University, Shaoxing, Zhejiang, 312000, China

    Guo Peng-fei & Yuan Ya-di

  2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology (Beijing), Beijing, 100083, China

    Guo Peng-fei, Tao Zhi-gang & Zhen En-ze

  3. Hebei Jianyan Architectural Design Co., LTD, Shijiazhuang, Hebei, 050021, China

    Lian Hong-da

  4. Wencheng Transportation Bureau, Wenzhou, Zhejiang, 325000, China

    Ye Keng-keng

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  1. Guo Peng-fei
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  2. Lian Hong-da
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  3. Ye Keng-keng
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  4. Tao Zhi-gang
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  5. Yuan Ya-di
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Correspondence to Guo Peng-fei.

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Peng-fei, G., Hong-da, L., Keng-keng, Y. et al. Study on the formation of gangue wall and the stress distribution of surrounding rock in gob side entry with roof cutting. Arab J Geosci 15, 1362 (2022). https://doi.org/10.1007/s12517-022-10632-2

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  • DOI: https://doi.org/10.1007/s12517-022-10632-2

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