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Characteristics and Control of Mining Induced Fractures above Longwall Mines Using Backfilling

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  • Shuokang Wang

    (Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining & Technology, Xuzhou 221116, China)

  • Liqiang Ma

    (Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining & Technology, Xuzhou 221116, China
    School of Energy, Xi’an University of Science and Technology, Xi’an 710054, China)

Abstract

Water conservation in mining is the key to solving the conflict between coal resource exploitation and ecological environment protection, especially in arid and semi-arid mining areas. Continuous excavation and continuous backfilling (CECB) in longwall mining is an important method to realize water conservation mining. Considering the different boundary conditions of the main roof stress in different mining phases, the mechanical models of clamped–clamped beam, continuous beam, and elastic foundation beam among filling body, main roof, and strata are established. Furthermore, the spatio-temporal evolution mechanisms of mining-induced fractures (MIF) are studied. It is found that there is a hyperbolic function relationship between MIF and the mining roadway (MR) filling percentages. Based on mining the XV coal seam under CECB in the Wangtaipu Coal Mine, the distribution patterns of MIF are studied. It is concluded that the distribution pattern is an isosceles trapezoid with the moving angle of overlying strata as the bottom angle, and the upper and lower boundary of MIF as the two parallel sides. Based on the influence coefficient of MR filling percentages on MIF, the curve of the MIF height is divided into three ranges, which include the stability control range, the critical range, and the lost control range. The controlling effects of MR filling percentages are studied, and the calculation expression of the MIF height in the stability control range is given. In engineering practice, 90% MR filling percentage is used for CECB. The MIF height is about 3.0 times of mining height, and the main roof beam is not broken. The water-resisting property of aquiclude III is not destroyed, thus, the mining does not adversely impact the water. The results provide theories and practices for controlling MIF under CECB in the conditions of extremely close distance aquifers.

Suggested Citation

  • Shuokang Wang & Liqiang Ma, 2019. "Characteristics and Control of Mining Induced Fractures above Longwall Mines Using Backfilling," Energies, MDPI, vol. 12(23), pages 1-24, December.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:23:p:4604-:d:293819
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    References listed on IDEAS

    as
    1. Yihe Yu & Liqiang Ma, 2019. "Application of Roadway Backfill Mining in Water-Conservation Coal Mining: A Case Study in Northern Shaanxi, China," Sustainability, MDPI, vol. 11(13), pages 1-22, July.
    2. Dan Ma & Xiexing Miao & Haibo Bai & Jihui Huang & Hai Pu & Yu Wu & Guimin Zhang & Jiawei Li, 2016. "Effect of mining on shear sidewall groundwater inrush hazard caused by seepage instability of the penetrated karst collapse pillar," 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. 82(1), pages 73-93, May.
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    Cited by:

    1. Yujun Xu & Liqiang Ma & Ichhuy NGO & Jiangtao Zhai, 2022. "Continuous Extraction and Continuous Backfill Mining Method Using Carbon Dioxide Mineralized Filling Body to Preserve Shallow Water in Northwest China," Energies, MDPI, vol. 15(10), pages 1-24, May.
    2. Yujun Xu & Liqiang Ma & Ichhuy NGO & Jiangtao Zhai, 2022. "Prediction of the Height of Water-Conductive Fractured Zone under Continuous Extraction and Partial Backfill Mining Method—A Case Study," Sustainability, MDPI, vol. 14(11), pages 1-30, May.
    3. Yihe Yu & Liqiang Ma & Dongsheng Zhang, 2019. "Characteristics of Roof Ground Subsidence While Applying a Continuous Excavation Continuous Backfill Method in Longwall Mining," Energies, MDPI, vol. 13(1), pages 1-20, December.
    4. Yujun Xu & Liqiang Ma & Naseer Muhammad Khan, 2020. "Prediction and Maintenance of Water Resources Carrying Capacity in Mining Area—A Case Study in the Yu-Shen Mining Area," Sustainability, MDPI, vol. 12(18), pages 1-27, September.

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