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The Spatial Evolution Law and Water Inrush Mechanism of Mining-Induced Overburden in Shallow and Short Coal Seam Group

Author

Listed:
  • Weidong Pan

    (School of Energy and Mining Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China
    Top-Coal Caving Mining Research of Coal Mining Industry, China University of Mining & Technology-Beijing, Beijing 100083, China)

  • Peng Jiang

    (School of Energy and Mining Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China
    Mine Safety Technology Branch, China Coal Research Institute, Beijing 100013, China
    State Key Laboratory of Coal Mining and Clean Utilization, China Coal Research Institute, Beijing 100013, China)

  • Boyang Li

    (School of Energy and Mining Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China
    Top-Coal Caving Mining Research of Coal Mining Industry, China University of Mining & Technology-Beijing, Beijing 100083, China)

  • Jianghua Li

    (Mine Safety Technology Branch, China Coal Research Institute, Beijing 100013, China
    State Key Laboratory of Coal Mining and Clean Utilization, China Coal Research Institute, Beijing 100013, China)

  • Yinchao Yang

    (Kailuan (Group) Co., Ltd., Tangshan 063000, China)

Abstract

In order to grasp the overburden evolution law of the shallow and short coal seam group, based on the key bed theory, a mechanical analysis of the longitudinal expansion of mining-induced overburden fractures in the coal seam group was carried out, and the spatial evolution characteristics of mining-induced overburden fractures were simulated by the numerical simulation method. The results show that in the process of working face advancement, with the continuous instability and failure of the overburden, the size and shape of the fracture network are also changed. The repeated mining of the lower coal seam further causes the secondary activation of the upper overburden, which makes the roof fractures of the partially compacted goaf violently move again. The “channel source” and “space source” continue to carry out the process of “generation-expansion-compression-generation-expansion”, in combination with pore fracture elastic theory. The water inrush characteristics of the whole coal seam are divided into three “solid-liquid” coupling stages: the original gap seepage stage, the initial water discharge stage of mining fissures and the water inrush stage of fractured rock mass. The steady value of water inflow and its variation characteristics with time are predicted by using the formula of deep well flow in a confined aquifer.

Suggested Citation

  • Weidong Pan & Peng Jiang & Boyang Li & Jianghua Li & Yinchao Yang, 2022. "The Spatial Evolution Law and Water Inrush Mechanism of Mining-Induced Overburden in Shallow and Short Coal Seam Group," Sustainability, MDPI, vol. 14(9), pages 1-16, April.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:9:p:5320-:d:804437
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    Cited by:

    1. Xiuchang Shi & Guangluo Lyu, 2023. "Mechanism of Bed Separation Water Inrush during the Mining of Extra-Thick Coal Seam under Super-Thick Sandstone Aquifer," Sustainability, MDPI, vol. 15(13), pages 1-17, July.
    2. Tao Yan & Chuanqu Zhu & Qingfeng Li & Qian Xu, 2023. "Investigating Disaster Mechanisms Triggered by Abrupt Overburden Fracture Alterations in Close-Seam Mining Beneath an Exceptionally Thick Sandstone Aquifer," Sustainability, MDPI, vol. 15(18), pages 1-15, September.

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