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Roof Hydraulic Fracturing for Preventing Floor Water Inrush under Multi Aquifers and Mining Disturbance: A Case Study

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  • Pengpeng Wang

    (School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
    Institute of Intelligent Manufacturing and Intelligent Mining, Yuncheng Vocational and Technical University, Yuncheng 054000, China)

  • Yaodong Jiang

    (School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China)

  • Qingshan Ren

    (School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China)

Abstract

Water inrush disasters from the coal seam floor occur frequently due to the high water pressure of the Ordovician limestone aquifer, multiple aquifers and strong mining disturbance. We presented a model of water-resisting key strata (WRKS) to investigate the mechanism of floor water inrush from multiple aquifers in deep coal mines. Roof hydraulic fracturing (RHF) for controlling floor water inrush and multi-parameter monitoring were proposed and validated in the Xingdong coal mine in Xingtai, Hebei Province. The results indicated that the periodic weighting step of the test working face after RHF was 9.53 m, which was 61.42% less than that of the working face without RHF (24.7 m). The floor failure depth was 30 m, which was 34.4% less than that of the zones without RHF (45.7 m). Hydraulic fracturing weakened the strength of the overlying strata to control the weighting step and reduce the mining disturbance stress, and the stability of the floor WRKS was enhanced, thereby preventing water inrush from the coal seam floor. The research results provide a solution for preventing floor damage and floor water inrush under strong mining disturbance and in complex hydrogeological environments in deep mining.

Suggested Citation

  • Pengpeng Wang & Yaodong Jiang & Qingshan Ren, 2022. "Roof Hydraulic Fracturing for Preventing Floor Water Inrush under Multi Aquifers and Mining Disturbance: A Case Study," Energies, MDPI, vol. 15(3), pages 1-22, February.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:3:p:1187-:d:743046
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    References listed on IDEAS

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    1. Hao Li & Haibo Bai & Jianjun Wu & Zhanguo Ma & Kai Ma & Guangming Wu & Yabo Du & Shixin He, 2017. "A Cascade Disaster Caused by Geological and Coupled Hydro-Mechanical Factors—Water Inrush Mechanism from Karst Collapse Column under Confining Pressure," Energies, MDPI, vol. 10(12), pages 1-19, November.
    2. Chunyuan Li & Jianping Zuo & Yue Shi & Chunchen Wei & Yuqing Duan & Yong Zhang & Hong Yu, 2021. "Deformation and fracture at floor area and the correlation with main roof breakage in deep longwall 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. 107(2), pages 1731-1755, June.
    3. Xinxin Zhou & Zhenhua Ouyang & Ranran Zhou & Zhenxing Ji & Haiyang Yi & Zhongyi Tang & Bo Chang & Chengcheng Yang & Bingcheng Sun, 2021. "An Approach to Dynamic Disaster Prevention in Strong Rock Burst Coal Seam under Multi-Aquifers: A Case Study of Tingnan Coal Mine," Energies, MDPI, vol. 14(21), pages 1-15, November.
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    Cited by:

    1. Lele Xiao & Fan Li & Chao Niu & Gelian Dai & Qian Qiao & Chengsen Lin, 2022. "Evaluation of Water Inrush Hazard in Coal Seam Roof Based on the AHP-CRITIC Composite Weighted Method," Energies, MDPI, vol. 16(1), pages 1-20, December.

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