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A Study on the Deformation Mechanism of the Rock Surrounding a Weakly Cemented Cross-Layer Roadway, under Tectonic Stress

Author

Listed:
  • Haijun Yu

    (College of Geology and Mines Engineering, Xinjiang University, Urumqi 830046, China)

  • Honglin Liu

    (College of Geology and Mines Engineering, Xinjiang University, Urumqi 830046, China
    Key Laboratory of Environmental Protection Mining for Minerals Resources at Universities of Education Department of Xinjiang Uygur Autonomous Region, Xinjiang University, Urumqi 830047, China)

  • Yang Xia

    (College of Geology and Mines Engineering, Xinjiang University, Urumqi 830046, China)

  • Mingcun Zhang

    (Xinjiang Hongxin Coal Industry Co., Ltd., China National Coal Group Corporation, Changji 831200, China)

  • Yinjian Hang

    (Xinjiang Sail Energy Co., Xuzhou Coal Mining Group, Tacheng 834700, China)

  • Wenjie Luo

    (College of Geology and Mines Engineering, Xinjiang University, Urumqi 830046, China)

Abstract

Maintaining the stability of the surrounding rock is an important prerequisite in ensuring the safe and efficient construction of underground mines—in particular, the surrounding rock of the cross-layer roadway, which is a combination of different media with different lithologies. Numerical models were established to investigate the effects of the different lateral pressure coefficients ( λ ), the angle (α) between the roadway and the maximum horizontal principal stress, and typical lithological combinations on the deformation of the surrounding rock of weakly cemented roadways. The main outcomes obtained from our research indicated the following: (1) under the action of tectonic stress, the focus should be on strengthening the roof of the roadway support of the slab, which is conducive to the stability of the surrounding rock; (2) roadway deformation and failure for the cases λ < 1.5 are approximately symmetrically distributed, whereas those for the cases λ > 1.5 are asymmetric; (3) roadway deformation and failure for the cases α < 45° are approximately symmetrically distributed, whereas those for the cases α > 45° are asymmetric; (4) tectonic stress has an important influence on stress redistribution, deformability, and damage in cross-layer roadways; and (5) when excavating cross-layer roadways under the action of tectonic stress, the concentrated stress around the end of the working face (especially the bottom corner) should be reduced. The research results provide insights for the roadway layout through coal seam and cross-layer excavation and deepen the understanding of the deformation mechanism of weakly cemented cross-layer roadway under tectonic stress.

Suggested Citation

  • Haijun Yu & Honglin Liu & Yang Xia & Mingcun Zhang & Yinjian Hang & Wenjie Luo, 2023. "A Study on the Deformation Mechanism of the Rock Surrounding a Weakly Cemented Cross-Layer Roadway, under Tectonic Stress," Energies, MDPI, vol. 16(6), pages 1-17, March.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:6:p:2546-:d:1090885
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    References listed on IDEAS

    as
    1. Guangzhe Xue & Chao Gu & Xinqiu Fang & Tao Wei, 2019. "A Case Study on Large Deformation Failure Mechanism and Control Techniques for Soft Rock Roadways in Tectonic Stress Areas," Sustainability, MDPI, vol. 11(13), pages 1-24, June.
    2. Honglin Liu & Dongsheng Zhang & Hongchao Zhao & Mingbo Chi & Wei Yu, 2019. "Behavior of Weakly Cemented Rock with Different Moisture Contents under Various Tri-Axial Loading States," Energies, MDPI, vol. 12(8), pages 1-15, April.
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