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Analysis of Roadheader for Breaking Rock Containing Holes under Confining Pressures

Author

Listed:
  • Zenghui Liu

    (School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, China
    Department of Civil Engineering, Monash University, Melbourne, VIC 3800, Australia)

  • Changlong Du

    (School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Hongxiang Jiang

    (School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Kai Liu

    (Department of Civil Engineering, Monash University, Melbourne, VIC 3800, Australia)

Abstract

Deep underground mines have high energy consumption due to the need to overcome the confining pressure. This study investigates the characteristics of the roadheader used for breaking rock containing a different number and size of holes under different confining pressures. A series of simulations were conducted using the LS-DYNA software to study the cutting torque, thrust force, specific energy, and failure mode during the rock-breaking process. Following this, the results were further validated with experimental data. It was found that the decrease in energy rates of rock containing different numbers (1, 5, 9, and 13) of holes are 12.7%, 19.3%, 25.9%, and 38.4%, respectively. Meanwhile, the decrease in energy rates of rock with different hole diameters (35, 45, 55, and 65 mm) are 10.5%, 19.3%, 24.6%, and 28.1%, respectively. Under the confining pressure of 10 MPa, the increase in the torque of the rock without holes is 23.5%, while this increase in the rock with five holes is 7.9%. This indicates that the high torque and energy consumption caused by the confining pressure can be reduced by drilling holes in the rock.

Suggested Citation

  • Zenghui Liu & Changlong Du & Hongxiang Jiang & Kai Liu, 2017. "Analysis of Roadheader for Breaking Rock Containing Holes under Confining Pressures," Energies, MDPI, vol. 10(8), pages 1-19, August.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:8:p:1154-:d:107234
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    References listed on IDEAS

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    1. Wenpu Li & Dongming Zhang & Minghui Li, 2016. "Failure Criteria of Gas-Infiltrated Sandy Shale Based on the Effective Stress Principle," Energies, MDPI, vol. 9(11), pages 1-17, November.
    2. Yiyu Lu & Songqiang Xiao & Zhaolong Ge & Zhe Zhou & Kai Deng, 2016. "Rock-Breaking Properties of Multi-Nozzle Bits for Tree-Type Drilling in Underground Coal Mines," Energies, MDPI, vol. 9(4), pages 1-17, March.
    3. Jianming He & Zhaobin Zhang & Xiao Li, 2017. "Numerical Analysis on the Formation of Fracture Network during the Hydraulic Fracturing of Shale with Pre-Existing Fractures," Energies, MDPI, vol. 10(6), pages 1-10, May.
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    Cited by:

    1. Ming Tao & Ao Ma & Kang Peng & Yiqing Wang & Kun Du, 2019. "Fracture Evaluation and Dynamic Stress Concentration of Granite Specimens Containing Elliptic Cavity under Dynamic Loading," Energies, MDPI, vol. 12(18), pages 1-20, September.

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