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Investigation of Hydraulic-Mechanical Properties of Paste Backfill Containing Coal Gangue-Fly Ash and Its Application in an Underground Coal Mine

Author

Listed:
  • Xinguo Zhang

    (State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China)

  • Jia Lin

    (School of Civil, Mining and Environmental Engineering, University of Wollongong, Wollongong, NSW 2500, Australia)

  • Jinxiao Liu

    (State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China
    College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, China)

  • Fei Li

    (College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, China)

  • Zhenzhong Pang

    (College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, China)

Abstract

Backfilling is widely used to control surface subsidence and stope stability to improve pillar recovery. Furthermore, it is also an effective way to process and dispose of mining waste such as coal gangue and tailings. In this study, the hydraulic-mechanical properties of cemented paste backfill materials (CPB) were investigated. Twenty-eight cemented coal gangue-fly ash backfill mixtures were prepared with different water, cement, fly ash and coal gangue content and the slump, segregation and water bleeding ratio tests were conducted. Increasing fly ash content increased the slump value and decreased the segregation value of the slurry. The uniaxial compressive strength (UCS) of the cemented coal gangue-fly ash backfill samples were tested at different curing times. Based on the test results, an optimized recipe was used for the field trial. Longwall cut and backfilling mining method was used in the 2300 mining district to recycle the coal pillar between longwall 2301 and 2302. Both stress and displacement meters were installed in the goaf and their performance was monitored continuously. An increase in stress and displacement values were observed to occur with the working face advanced (up to 325 m and 375 m, respectively); thereafter, a trend of stabilization was observed. The monitoring results suggest that the backfills can efficiently control the roof movement and surface subsidence as well as improve pillar recovery.

Suggested Citation

  • Xinguo Zhang & Jia Lin & Jinxiao Liu & Fei Li & Zhenzhong Pang, 2017. "Investigation of Hydraulic-Mechanical Properties of Paste Backfill Containing Coal Gangue-Fly Ash and Its Application in an Underground Coal Mine," Energies, MDPI, vol. 10(9), pages 1-19, September.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:9:p:1309-:d:110628
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    References listed on IDEAS

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    1. repec:mpr:mprres:7435 is not listed on IDEAS
    2. Yanli Huang & Junmeng Li & Tianqi Song & Guoqiang Kong & Meng Li, 2016. "Analysis on Filling Ratio and Shield Supporting Pressure for Overburden Movement Control in Coal Mining with Compacted Backfilling," Energies, MDPI, vol. 10(1), pages 1-23, December.
    3. Nan Zhou & Jixiong Zhang & Hao Yan & Meng Li, 2017. "Deformation Behavior of Hard Roofs in Solid Backfill Coal Mining Using Physical Models," Energies, MDPI, vol. 10(4), pages 1-20, April.
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    Cited by:

    1. Qiangqiang Cheng & Yaben Guo & Chaowei Dong & Jianfei Xu & Wanan Lai & Bin Du, 2021. "Mechanical Properties of Clay Based Cemented Paste Backfill for Coal Recovery from Deep Mines," Energies, MDPI, vol. 14(18), pages 1-14, September.
    2. Linhao Li & Guangcheng Long & Chaoneng Bai & Kunlin Ma & Meng Wang & Sheng Zhang, 2020. "Utilization of Coal Gangue Aggregate for Railway Roadbed Construction in Practice," Sustainability, MDPI, vol. 12(11), pages 1-20, June.
    3. 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.
    4. 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.
    5. Wanpeng Huang & Tianneng Song & Huanyu Li & Yaxin Liu & Tao Hou & Mingtao Gao & Yongsheng Zheng, 2023. "Design of Key Parameters for Strip–Filling Structures Using Cemented Gangue in Goaf—A Case Study," Sustainability, MDPI, vol. 15(6), pages 1-19, March.

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