Improving stress environment in development entries through an alternate longwall mining layout

  • Pengfei Wang
  • Jingli Zhao
  • Guorui Feng
  • Zhiqiang Wang
Original Paper

Abstract

Most coal mines in China use the longwall mining system. High stresses are frequently encountered around development entries at deep mines. This paper presents an alternate longwall mining layout for thick coal seams to minimize ground control problems. In a conventional longwall panel layout, development entries on both ends of the panel are located along the floor, and a coal pillar (chain pillar) is left between adjacent panels to ensure stability. Gateroads on either end of a longwall panel using the layout proposed in this paper are located at different vertical levels within a thick coal seam or in a geologically split coal seam for improved stability. The headgate entry/ies are driven along the floor while the tailgate entry/ies are driven along the roof. Therefore, a longwall face has a gradually elevated or curved section on one end of the panel. For the adjacent panel, the development entry may be located directly below the development entry of the previous panel or may be offset horizontally with respect to it. Based on physical and numerical modeling approaches, it is demonstrated that the stress environment for development entries employing the longwall layout is significantly improved; ground control problems are therefore minimized.

Keywords

Longwall mining Stress environment Curved section Numerical modeling Tailgate entries 

Notes

Acknowledgements

Special thanks to Y. P. Chugh, Professor Emeritus and visiting professor at Southern Illinois University Carbondale, who performed significant review and editing of the manuscript.

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Copyright information

© Saudi Society for Geosciences 2018

Authors and Affiliations

  • Pengfei Wang
    • 1
  • Jingli Zhao
    • 2
    • 3
  • Guorui Feng
    • 1
    • 4
  • Zhiqiang Wang
    • 2
  1. 1.College of Mining EngineeringTaiyuan University of TechnologyTaiyuanChina
  2. 2.College of Resource and Safety EngineeringChina University of Mining and Technology (Beijing)BeijingChina
  3. 3.Russian Academy of Natural SciencesMoscowRussia
  4. 4.Shanxi Engineering Research Center for Green MiningTaiyuanChina

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