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Application of Roadway Backfill Mining in Water-Conservation Coal Mining: A Case Study in Northern Shaanxi, China

Author

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  • Yihe Yu

    (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

The mining induced subsidence and strata deformation are likely to affect the stability of the aquiclude, resulting in loss of water resources in the mining area. In order to reduce the disturbance of coal mining to the overlying strata and to preserve the water resources in the coal mining area, the roadway backfill mining (RBM) method was trialed in Yuyang coal mine in Northern Shaanxi, China. Based on pressure arch theory and ultimate strength theory, a mechanical model was developed to analyze the stability of coal pillars. Then the maximum number of vacant roadways between the mining face and the backfilling face was determined according to the stability of coal pillar and filling body. The method to calculate aquiclude subsidence and deformation was also proposed. Furthermore, as indicated by FLAC3D numerical simulations, the maximum tensile stress subjected by the aquiclude was 0.14 MPa, which is smaller than its tensile strength; the horizontal deformation was 0.24 mm/m, which is also smaller than the critical deformation of failure. Field monitoring data demonstrated a maximum of 2.76 m groundwater level drop in the mining area after mining. The groundwater level was determined to be 4.45~10.83 m below surface, ensuring the normal growth of surface vegetation and realizing the water-conservation coal mining (WCCM).

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jsusta:v:11:y:2019:i:13:p:3719-:d:246472
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    References listed on IDEAS

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    1. Wenhao Cao & Xufeng Wang & Peng Li & Dongsheng Zhang & Chundong Sun & Dongdong Qin, 2018. "Wide Strip Backfill Mining for Surface Subsidence Control and Its Application in Critical Mining Conditions of a Coal Mine," Sustainability, MDPI, vol. 10(3), pages 1-16, March.
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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. 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.
    4. 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.
    5. 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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