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Prediction of the Height of Water-Conductive Fractured Zone under Continuous Extraction and Partial Backfill Mining Method—A Case Study

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  • Yujun Xu

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

  • Liqiang Ma

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

  • Ichhuy NGO

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

  • Jiangtao Zhai

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

Abstract

Longwall backfill mining effectively mitigates the height of water-conductive fractured zone (HWCFZ), preventing it from reaching the overlying aquifer and thus preserving the groundwater. However, it has the disadvantages of insufficient filling time and space as well as the mutual constraints between filling and mining. A novel continuous extraction and partial backfill (CEPB) water-preserving mining method was therefore proposed. The analytic hierarchy process (AHP) method was employed to identify the factors affecting the HWCFZ of CEPB, and five main factors, namely, the hard-rock lithology ratio, mining height and depth, and the width of the Wongawilli and protective block, were determined based on the weight distribution. UDEC software was used to establish a numerical model to simulate the HWCFZ under five factors. By using a multiple linear regression analysis of the numerical simulation results, a model for predicting the HWCFZ was established. It was applied in a colliery of the Yu-Shen mining area, and the HWCFZ was 57.7 m, 9% higher than that of borehole television logging of 53.1 m from the field measurement, indicating its rationality. Subsequently, the model was generalized and applied to the whole mining area, and the thematic map of the HWCFZ and the protective zone thickness of CEPB and longwall caving mining were obtained. The criterion for water-preserving mining based on the equivalent permeability coefficient of the protective zone is then proposed, which can provide guidance for the mining parameters optimization of the CEPB.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:11:p:6582-:d:825845
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    References listed on IDEAS

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    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 & Yihe Yu, 2020. "Water Preservation and Conservation above Coal Mines Using an Innovative Approach: A Case Study," Energies, MDPI, vol. 13(11), pages 1-28, June.
    3. 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.
    4. 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.
    5. 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.
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    Cited by:

    1. Dangyu Zhang & Shiqi Liu & Dongyu Guo & Yubao Li & Wenxuan Song & Yiming Wang & Yang Liu, 2023. "Pipe Piles and Key Stratum Modeling for Grouting Reinforcement of Mine Floors under Mining Disturbance and Microseismic Monitoring Evaluation," Sustainability, MDPI, vol. 15(12), pages 1-21, June.

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