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Study on the Influence of Roadway Structural Morphology on the Mechanical Properties of Weakly Cemented Soft Rock Roadways

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  • Yongli Liu

    (Key Laboratory of Mining Engineering of Heilongjiang Province College, Heilongjiang University of Science and Technology, Harbin 150022, China)

  • Jingtao Li

    (Key Laboratory of Mining Engineering of Heilongjiang Province College, Heilongjiang University of Science and Technology, Harbin 150022, China)

  • Yanwei Duan

    (Key Laboratory of Mining Engineering of Heilongjiang Province College, Heilongjiang University of Science and Technology, Harbin 150022, China)

  • Tao Qin

    (Key Laboratory of Mining Engineering of Heilongjiang Province College, Heilongjiang University of Science and Technology, Harbin 150022, China)

  • Zhenwen Liu

    (Key Laboratory of Mining Engineering of Heilongjiang Province College, Heilongjiang University of Science and Technology, Harbin 150022, China)

Abstract

We used the 11,303 return air roadway of the Hongqingliang coal mine as the engineering background for a study exploring the impact of the structural morphology of the roadway on the stress distribution characteristics and the stability of a weakly cemented soft-rock mine roadway. This work studies the evolution law of stress and deformation, and the plastic zone of weakly cemented soft-rock roadways with retaining the top or bottom coal seams. The results show that when retaining the top coal is replaced by the bottom coal, the high-stress zone of the vertical stress is reduced, the peak stress is decreased, and the stress concentration coefficient is slightly reduced from 1.67 to 1.64. The peak value of the vertical displacement of the roof of the shaft which was 78.4% of that of the top coal also decreases significantly, while the peak value of the vertical displacement of the floor, which was 1.37 times that of the top coal, increases. The equal area method was used to change the aspect ratio of the roadway. When the aspect ratio decreased from 1.38 to 0.88, the high-stress zone of the vertical stress was reduced, the stress peak decreased, and the stress concentration coefficient decreased from 1.8 to 1.75. The vertical displacement of the roof increased by 27.7% from 10.91 mm to 13.93 mm, and the vertical displacement of the floor increased by 15.2% from 6.60 mm to 7.60 mm. The plastic failure range was significantly reduced, particularly at the bottom corners. These findings show that structural morphology has a great influence on the floor heave of weakly cemented soft rock. Reasonable retention of the top or bottom coal and the aspect ratio of the roadway can prevent the deformation and failure of the roadway in weakly cemented soft rock.

Suggested Citation

  • Yongli Liu & Jingtao Li & Yanwei Duan & Tao Qin & Zhenwen Liu, 2023. "Study on the Influence of Roadway Structural Morphology on the Mechanical Properties of Weakly Cemented Soft Rock Roadways," Sustainability, MDPI, vol. 15(1), pages 1-16, January.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:1:p:821-:d:1023025
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    References listed on IDEAS

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    1. Qi Ma & Yidong Zhang & Linsheng Gao & Zexin Li & Guangyuan Song & Yu Zheng, 2022. "The Optimization of Coal Pillars on Return Air Sides and the Reasonable Horizon Layout of Roadway Groups in Highly Gassy Mines," Sustainability, MDPI, vol. 14(15), pages 1-16, August.
    2. Tahir Ali Akbar & Siddique Ullah & Waheed Ullah & Rafi Ullah & Raja Umer Sajjad & Abdullah Mohamed & Alamgir Khalil & Muhammad Faisal Javed & Anwarud Din, 2022. "Development and Application of Models for Landslide Hazards in Northern Pakistan," Sustainability, MDPI, vol. 14(16), pages 1-17, August.
    3. Kai Wang & Yanli Huang & Huadong Gao & Wen Zhai & Yongfeng Qiao & Junmeng Li & Shenyang Ouyang & Wei Li, 2020. "Recovery Technology of Bottom Coal in the Gob-Side Entry of Thick Coal Seam Based on Floor Heave Induced by Narrow Coal Pillar," Energies, MDPI, vol. 13(13), pages 1-20, July.
    4. Xingping Lai & Huicong Xu & Pengfei Shan & Yanlei Kang & Zeyang Wang & Xuan Wu, 2020. "Research on Mechanism and Control of Floor Heave of Mining-Influenced Roadway in Top Coal Caving Working Face," Energies, MDPI, vol. 13(2), pages 1-14, January.
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    Cited by:

    1. Jinmao Ju & Honglin Liu & Hongqian Hu & Yinjian Hang & Chengfang Shan & Hongzhi Wang, 2023. "Analysis of Control Technology for Large Deformation of a Geological Bedding Bias Tunnel with Weakly Cemented Surrounding Rock," Sustainability, MDPI, vol. 15(18), pages 1-15, September.

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