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Deformation Behavior of Hard Roofs in Solid Backfill Coal Mining Using Physical Models

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  • Nan Zhou

    (State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Xuzhou 221116, China)

  • Jixiong Zhang

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

  • Hao Yan

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

  • Meng Li

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

Abstract

Solid backfill coal mining technology has been widely applied in coal seams that are at risk of hard roof. Using actual measured strain–stress curves of the backfill body and the similarity theory, this study designed and employed four experimental models for physical simulation, corresponding to roof-controlled backfilling ratios of 0%, 40%, 82.5% and 97% using the geological conditions of Face No. 6304 in the Jining No. 3 coal mine—a solid backfill coal mining face under a hard roof. A non-contact strain measurement system and pressure sensors were used to monitor the deformation of the overlying strata and changes in abutment stress ahead of the face during mining of the models for varying roof-controlled backfilling ratios. The results indicated that the solid backfill body was able to support the roof. As the roof-controlled backfilling ratio was increased, the maximum subsidence of the roof and the maximum height of the cracks decreased. When the roof-controlled backfilling ratio was 82.5% or higher, the working face did not display any obvious initial fractures or periodic fractures, and both the value and the impact range of the abutment stress ahead of the face decreased.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:4:p:557-:d:96109
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    References listed on IDEAS

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    1. Liang Wang & Yuan-ping Cheng & Chao Xu & Feng-hua An & Kan Jin & Xiao-lei Zhang, 2013. "The controlling effect of thick-hard igneous rock on pressure relief gas drainage and dynamic disasters in outburst coal seams," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 66(2), pages 1221-1241, March.
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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. Ningbo Zhang & Changyou Liu & Baobao Chen, 2018. "A Case Study of Presplitting Blasting Parameters of Hard and Massive Roof Based on the Interaction between Support and Overlying Strata," Energies, MDPI, vol. 11(6), pages 1-14, May.
    3. Wenlong Shen & Meng Wang & Zhengzheng Cao & Faqiang Su & Hua Nan & Xuelong Li, 2019. "Mining-Induced Failure Criteria of Interactional Hard Roof Structures: A Case Study," Energies, MDPI, vol. 12(15), pages 1-17, August.
    4. Jun Guo & Guorui Feng & Pengfei Wang & Tingye Qi & Xiaorong Zhang & Yonggan Yan, 2018. "Roof Strata Behavior and Support Resistance Determination for Ultra-Thick Longwall Top Coal Caving Panel: A Case Study of the Tashan Coal Mine," Energies, MDPI, vol. 11(5), pages 1-19, April.
    5. 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.
    6. Yao Lu & Ning Jiang & Wei Lu & Meng Zhang & Dezhi Kong & Mengtang Xu & Changxiang Wang, 2022. "Experimental Study on Deformation Characteristics of Gangue Backfill Zone under the Condition of Natural Water in Deep Mines," Sustainability, MDPI, vol. 14(23), pages 1-16, November.
    7. 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.

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