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Analysis of Overlying Strata Movement and Behaviors in Caving and Solid Backfilling Mixed Coal Mining

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  • Yanli Huang

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

  • Jixiong Zhang

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

  • Wei Yin

    (Faculty of Transportation Engineering, Huaiyin Institute of Technology, Xuzhou 221116, China)

  • Qiang Sun

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

Abstract

Based on techniques of close upper protective coal-rock layer mining, relieved gas extraction, and underground gangue washing-discharging-backfilling, this paper initiates the concept of mixed fully-mechanized coal mining, which combines a solid backfilling method and a caving method (hereinafter referred to as “backfill and caving mixed mining”). After the principle and key techniques are introduced, a physical simulation experiment and a numerical simulation are used to study the characteristics of the overlying strata’s fracture development, the main roof subsidence, the stress field and its influence area in the transition area with the length ratios of the backfilling section and the caving section, and the advancing distance of the mixed longwall face. Thus, the lengths of the caving section and the backfilling section, the parameters of the support system in the transition section, and the design process of the mixed longwall face are presented. In practice, the mixed longwall face Ji 15 -31010 in Ping-dingshan No. 12 Colliery proves that the designed lengths of 120 m and 100 m for the backfilling section and the caving section, respectively, are appropriate. The monitoring results of the hydraulic support working resistance show that the supports were working well in general; the maximum growth height of the overlying strata fracture is 18 m; the gas drainage efficiency is up to 80% and the average gas concentration is 0.1 g/m 3 ; a large quantity of gangue generated in the Ji 14 seam is disposed underground; coal and gas are extracted simultaneously; and significant environmental and economic benefits are realized.

Suggested Citation

  • Yanli Huang & Jixiong Zhang & Wei Yin & Qiang Sun, 2017. "Analysis of Overlying Strata Movement and Behaviors in Caving and Solid Backfilling Mixed Coal Mining," Energies, MDPI, vol. 10(7), pages 1-16, July.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:7:p:1057-:d:105453
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    Citations

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    Cited by:

    1. Hengjie Luan & Yujing Jiang & Huili Lin & Yahua Wang, 2017. "A New Thin Seam Backfill Mining Technology and Its Application," Energies, MDPI, vol. 10(12), pages 1-16, December.
    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. 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.
    4. Wen Zhai & Wei Li & Yanli Huang & Shenyang Ouyang & Kun Ma & Junmeng Li & Huadong Gao & Peng Zhang, 2020. "A Case Study of the Water Abundance Evaluation of Roof Aquifer Based on the Development Height of Water-Conducting Fracture Zone," Energies, MDPI, vol. 13(16), pages 1-16, August.
    5. Adam Smoliński & Dmyto Malashkevych & Mykhailo Petlovanyi & Kanay Rysbekov & Vasyl Lozynskyi & Kateryna Sai, 2022. "Research into Impact of Leaving Waste Rocks in the Mined-Out Space on the Geomechanical State of the Rock Mass Surrounding the Longwall Face," Energies, MDPI, vol. 15(24), pages 1-16, December.
    6. Yuan Gao & Jiandong Huang & Meng Li & Zhongran Dai & Rongli Jiang & Jixiong Zhang, 2021. "Chemical Modification of Combusted Coal Gangue for U(VI) Adsorption: Towards a Waste Control by Waste Strategy," Sustainability, MDPI, vol. 13(15), pages 1-13, July.
    7. André Vervoort, 2020. "The Time Duration of the Effects of Total Extraction Mining Methods on Surface Movement," Energies, MDPI, vol. 13(16), pages 1-12, August.
    8. Weiqing Zhang & Chaowei Dong & Peng Huang & Qiang Sun & Meng Li & Jun Chai, 2020. "Experimental Study on the Characteristics of Activated Coal Gangue and Coal Gangue-Based Geopolymer," Energies, MDPI, vol. 13(10), pages 1-14, May.
    9. 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.
    10. Krzysztof Skrzypkowski, 2021. "Determination of the Backfilling Time for the Zinc and Lead Ore Deposits with Application of the BackfillCAD Model," Energies, MDPI, vol. 14(11), pages 1-19, May.

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