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Analysis of Development Pattern of a Water-Flowing Fissure Zone in Shortwall Block Mining

Author

Listed:
  • Yun Zhang

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

  • Shenggen Cao

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

  • Lixin Lan

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

  • Rui Gao

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

  • Hao Yan

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

Abstract

In order to effectively recover the residual coal resources, such as coal pillars and irregular coal blocks induced by large-scale extensive mining, in this study, we proposed a shortwall block mining (SBM) technology and examined the development pattern of the water-flowing fissure zone (WFZ) in the overlying strata during the SBM process. By analyzing the overlying rocks’ movement rules in SBM, the main controlling factors affecting the development of the height of the water-flowing fissure zone (HWFZ) determined are as follows: mining height, block length, and the width of the protective coal pillar among the blocks. Moreover, based on the elastic foundation beam theory, the mechanical model for the calculation of HWFZ in SBM was established. Based on the first strength theory, the calculation formula of the development HWFZ was derived. Using this model, the calculated HWFZ after SBM was 50.3 m, whereas the measured heights of the leakage of drilling washing fluid were 47.98 and 50.06 m, respectively. The calculated values almost fit well with the field-measured data, verifying the reliability of the proposed mechanical model. The results of this study can provide a significant reference for enhancing the recovery ratio of coal resources and optimizing water protection mining theory.

Suggested Citation

  • Yun Zhang & Shenggen Cao & Lixin Lan & Rui Gao & Hao Yan, 2017. "Analysis of Development Pattern of a Water-Flowing Fissure Zone in Shortwall Block Mining," Energies, MDPI, vol. 10(5), pages 1-13, May.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:5:p:734-:d:99238
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    References listed on IDEAS

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    1. Wei Zhang & Dong-Sheng Zhang & Li-Xin Wu & Hong-Zhi Wang, 2014. "On-Site Radon Detection of Mining-induced Fractures from Overlying Strata to the Surface: A Case Study of the Baoshan Coal Mine in China," Energies, MDPI, vol. 7(12), pages 1-25, December.
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    Cited by:

    1. Yun Zhang & Shenggen Cao & Rui Gao & Shuai Guo & Lixin Lan, 2018. "Prediction of the Heights of the Water-Conducting Fracture Zone in the Overlying Strata of Shortwall Block Mining Beneath Aquifers in Western China," Sustainability, MDPI, vol. 10(5), pages 1-20, May.
    2. Weiyong Lu & Changchun He & Xin Zhang, 2020. "Height of overburden fracture based on key strata theory in longwall face," PLOS ONE, Public Library of Science, vol. 15(1), pages 1-15, January.
    3. Meng Li & Nan Zhou & Jixiong Zhang & Zhicheng Liu, 2017. "Numerical Modelling of Mechanical Behavior of Coal Mining Hard Roofs in Different Backfill Ratios: A Case Study," Energies, MDPI, vol. 10(7), pages 1-18, July.

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