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A Case Study of Presplitting Blasting Parameters of Hard and Massive Roof Based on the Interaction between Support and Overlying Strata

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  • Ningbo Zhang

    (School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
    School of Civil, Mining and Environmental Engineering, Faculty of Engineering and Information Sciences, University of Wollongong, Wollongong, NSW 2522, Australia
    School of Mines, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China)

  • Changyou Liu

    (School of Mines, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China)

  • Baobao Chen

    (School of Mines, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China)

Abstract

Due to the existence of a hard and massive roof (HMR), severe ground pressure behaviors have been observed at the working face, resulting in safety issues and the degradation of production effectiveness. Based on the HMR conditions of the Datong Mining Area, the fracture-related instability of the HMR and its effects on the support selection were investigated by analyzing the interaction between support and overlying strata. Advancefixed-distance presplitting blasting (AFPB) technology was proposed to control the caving interval of HMR, and the influence of the controlled interval on the working load of supports was also analyzed. The working load of the support and the caving interval of the HMR were determined based on the controlled HMR fracture technology, and these were verified by field application tests. The working resistance of the support and the step distance were determined based on controlled roof fracture and were verified by on-site application experiments. The results revealed that cracks emerged after the presplitting blasting, resulting in significantly reduced strata behaviors. Furthermore, the support exhibited good adaptability.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:6:p:1363-:d:149255
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    References listed on IDEAS

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    1. 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.
    2. Wei-bin Guo & Hong-sheng Wang & Guo-wei Dong & Lei Li & Yao-guang Huang, 2017. "A Case Study of Effective Support Working Resistance and Roof Support Technology in Thick Seam Fully-Mechanized Face Mining with Hard Roof Conditions," Sustainability, MDPI, vol. 9(6), pages 1-17, June.
    3. Jingxuan Yang & Changyou Liu & Bin Yu, 2017. "Application of Confined Blasting in Water-Filled Deep Holes to Control Strong Rock Pressure in Hard Rock Mines," Energies, MDPI, vol. 10(11), pages 1-16, November.
    4. 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.
    5. Zhaohui Chong & Xuehua Li & Xiangyu Chen & Ji Zhang & Jingzheng Lu, 2017. "Numerical Investigation into the Effect of Natural Fracture Density on Hydraulic Fracture Network Propagation," Energies, MDPI, vol. 10(7), pages 1-33, July.
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    Cited by:

    1. 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.

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