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Numerical Modeling and Investigation of Fault-Induced Water Inrush Hazard under Different Mining Advancing Directions

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  • Chong Li

    (MOE Key Laboratory of Deep Coal Resource Mining, School of Mines, China University of Mining & Technology, Xuzhou 221116, China
    Jiangsu Laboratory of Mine Earthquake Monitoring and Prevention, China University of Mining & Technology, Xuzhou 221116, China)

  • Zhijun Xu

    (MOE Key Laboratory of Deep Coal Resource Mining, School of Mines, China University of Mining & Technology, Xuzhou 221116, China)

Abstract

Evaluations of the risk of fault-induced water inrush hazard is an important issue for mining engineering applications. According to the characteristics of the seam floor during mining advancing, a mechanical model of fault activation is built to obtain the equations of normal stress and shear stress on the surface of fault, as well as the mechanics criterion of fault activation. Furthermore, using FLAC 3D numerical software, the stress variation on the surface of fault under two different mining advancing directions are numerically simulated, and the distribution characteristics of the plastic failure zone of the roof and floor near the fault are obtained. The results show that: (1) When mining advances from the hanging wall, the normal stress increases more greatly than that from the foot wall, the shear stress distribution changes drastically with a large peak, and it is more likely to cause fault activation. (2) When mining advances from the hanging wall and approaches the fault, the normal stress and shear stress within the fault first increases, and then decreases suddenly. When mining advances from the foot wall, the normal stress and shear stress increases constantly, and the fault zone stays in the compaction state where the hanging wall and foot wall are squeezed together, which is unfavorable for water inrush hazard. (3) When mining advances from the hanging wall, the deep-seated fault under the floor is damaged first, and the plastic failure zone of the floor increases obviously. When mining advances from the foot wall, the shallow fault under the floor is damaged first, and the plastic failure zone of roof increases obviously. (4) For a water-conducting fault, the waterproof coal pillar size of the mining advancing from the hanging wall should be larger than that from the foot wall. (5) The in-situ monitoring results are in agreement with the simulation results, which proves the effectiveness of the simulation.

Suggested Citation

  • Chong Li & Zhijun Xu, 2022. "Numerical Modeling and Investigation of Fault-Induced Water Inrush Hazard under Different Mining Advancing Directions," Mathematics, MDPI, vol. 10(9), pages 1-12, May.
  • Handle: RePEc:gam:jmathe:v:10:y:2022:i:9:p:1561-:d:809122
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    References listed on IDEAS

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    1. Shangxian Yin & Jincai Zhang & Demin Liu, 2015. "A study of mine water inrushes by measurements of in situ stress and rock failures," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 79(3), pages 1961-1979, December.
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    Cited by:

    1. Chongwei Xin & Fuxing Jiang & Changzhi Zhai & Yan Chen, 2023. "Analysis of Coal Floor Fault Activation Inducing Water Inrush Using Microseismic Monitoring—A Case Study in Zhaogu No. 1 Coal Mine of Henan Province, China," Sustainability, MDPI, vol. 15(9), pages 1-16, April.
    2. Shaofeng Wang & Xin Cai & Jian Zhou & Zhengyang Song & Xiaofeng Li, 2022. "Analytical, Numerical and Big-Data-Based Methods in Deep Rock Mechanics," Mathematics, MDPI, vol. 10(18), pages 1-5, September.

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