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Mechanical behavior of a coal seam penetrated by a karst collapse pillar: mining-induced groundwater inrush risk

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  • Dan Ma
  • Haibo Bai
  • Yanmeng Wang

Abstract

A karst collapse pillar (KCP) is caused by the karst subsidence that occurs in carbonate rock distribution areas. Current KCP studies focus mainly on aspects such as the cause of formation, rule of development, groundwater inrush, and structural characteristics of the pillar and sidewall rock body. However, few existing studies focus on the influences of mining activity on the damage to KCP, its surrounding rocks, and the formation of the fracture zone, especially the mechanical behavior. In this paper, a numerical fast Lagrangian analysis of continua in three dimensions model was created to understand the mechanical state of a coal seam penetrated by a KCP during mining panel extraction. The numerical results suggest that (1) because of the structure defect, the stress field strongly depends on the mining activity, and the stress distribution varies in different parts of the KCP; (2) KCP and the surrounding rocks show dislocation when the working face passes the KCP, at which point shear failure may then occur, which will lead to a sidewall channel for groundwater inrush; and (3) as mining advances, the plastic zone in the KCP and its broken area develop gradually until the upper and lower plastic zones connect when the working face passes the KCP, which will cause a channel for groundwater inrush. Copyright Springer Science+Business Media Dordrecht 2015

Suggested Citation

  • Dan Ma & Haibo Bai & Yanmeng Wang, 2015. "Mechanical behavior of a coal seam penetrated by a karst collapse pillar: mining-induced groundwater inrush risk," 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. 75(3), pages 2137-2151, February.
    • Handle: RePEc:spr:nathaz:v:75:y:2015:i:3:p:2137-2151
    DOI: 10.1007/s11069-014-1416-9
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    Citations

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    Cited by:

    1. Qiang Sun & Jixiong Zhang & Qiang Zhang & Xu Zhao, 2017. "Analysis and Prevention of Geo-Environmental Hazards with High-Intensive Coal Mining: A Case Study in China’s Western Eco-Environment Frangible Area," Energies, MDPI, vol. 10(6), pages 1-15, June.
    2. Gangye Guo & Hongpu Kang & Deyu Qian & Fuqiang Gao & Yang Wang, 2018. "Mechanism for Controlling Floor Heave of Mining Roadways Using Reinforcing Roof and Sidewalls in Underground Coal Mine," Sustainability, MDPI, vol. 10(5), pages 1-15, May.
    3. 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.
    4. Cun Zhang & Shihao Tu, 2016. "Control technology of direct passing karstic collapse pillar in longwall top-coal caving mining," 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. 84(1), pages 17-34, October.
    5. Rui Gao & Bin Yu & Hongchun Xia & Hongfei Duan, 2017. "Reduction of Stress Acting on a Thick, Deep Coal Seam by Protective-Seam Mining," Energies, MDPI, vol. 10(8), pages 1-15, August.

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