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Study on the failure characteristics of overburden and the evolution law of seepage field in deep buried thick coal seam under aquifers

Author

Listed:
  • Yang Li

    (China University of Mining and Technology-Beijing)

  • Xinghai Lei

    (China University of Mining and Technology-Beijing)

  • Nan Wang

    (China University of Mining and Technology-Beijing)

  • Yuqi Ren

    (China University of Mining and Technology-Beijing)

  • Xiangyang Jin

    (China University of Mining and Technology-Beijing)

  • Guoshuai Li

    (China University of Mining and Technology-Beijing)

  • Tiezheng Li

    (China University of Mining and Technology-Beijing)

  • Xiangji Ou

    (China University of Mining and Technology-Beijing)

Abstract

Water inrush at roof area seriously affects the safety of coal mines. The characteristics of aquifer and aquiclude at Wutongzhuang Mine are analyzed. Considering the effect of seepage field, a formula for calculating the height of water-conducting fractured zone (HWCFZ) in deep buried thick coal seam mining is derived. A damage-seepage coupling model with rock porosity and damage factor as independent variables is established. FLAC3D is re-developed by using FISH language, and the fluid–solid coupling calculation model of deep buried thick coal seam mining is established. The evolution law of the plastic zone, seepage field and water-conducting fractured zone (WCFZ)of the overburden in the gob with the advancement of the working face is analyzed, the main conclusions are as follows: With the continuous advancement of the working face, the distribution shape of the plastic zone and seepage field has changed from a trapezoidal to a saddle shape; when the working face reaches full mining, the maximum heights of the caving zone, fractured zone and HWCFZ are 24 m, 113 m, and 123 m, respectively; The 50 m-thick sandy shale aquifer is penetrated by the WCFZ, and the WCFZ on the side of the working face above the gob is the main water channel when the working face is advanced to 220 m. The on-site monitoring results showed that mine water inflow is not affected by surface rainfall and the 50 m-thick sandy shale is successively connected by the WCFZ. The results of comprehensive research showed that the HWCFZ cannot be calculated by traditional formulas when mining deep buried thick coal seams.

Suggested Citation

  • Yang Li & Xinghai Lei & Nan Wang & Yuqi Ren & Xiangyang Jin & Guoshuai Li & Tiezheng Li & Xiangji Ou, 2023. "Study on the failure characteristics of overburden and the evolution law of seepage field in deep buried thick coal seam under aquifers," 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. 118(2), pages 1035-1064, September.
    • Handle: RePEc:spr:nathaz:v:118:y:2023:i:2:d:10.1007_s11069-023-06036-4
    DOI: 10.1007/s11069-023-06036-4
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    References listed on IDEAS

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    1. Xiaohong Niu & Guorui Feng & Qin Liu & Yanna Han & Ruipeng Qian, 2022. "Numerical investigation on mechanism and fluid flow behavior of goaf water inrush: a case study of Dongyu coal mine," 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. 113(3), pages 1783-1802, September.
    2. Feng Du & Rui Gao, 2017. "Development Patterns of Fractured Water-Conducting Zones in Longwall Mining of Thick Coal Seams—A Case Study on Safe Mining Under the Zhuozhang River," Energies, MDPI, vol. 10(11), pages 1-16, November.
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    Cited by:

    1. Hou-You Zhou & Dian-Shu Liu & Zheng-Hua Gao & En-An Chi & Jun-Ying Rao & Tao Hu, 2024. "Dynamic Failure Characteristics of Sandstone Containing Different Angles of Pre-Existing Crack Defects," Mathematics, MDPI, vol. 12(11), pages 1-29, May.

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