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    Grain-size distribution curve of sand and gravel particles

     
    2024, 46(10): 2212-2220.
    Wear characteristics of shield cutters in sand-pebble strata based on EDEM .

    Figures of the Article

    • Grain-size distribution curve of sand and gravel particles
    • Failure characteristics of specimen
    • Numerical triaxial shear tests
    • Stress-strain curves of specimen
    • Principle of Archard wear model
    • Model for pebble particle
    • Schematic diagram of particle bed and compression force
    • Schematic diagram of tool configuration mode
    • Model for spoke type cutter head
    • Numerical model for EDEM shield tunnelling model
    • Relationship between wear value of ripper and length of.cutting trace
    • Wear characteristics of ripper
    • Wear characteristics of scraper
    • Wear characteristics of radial rippers
    • Wear characteristics of circumferential rippers
    • Example of actual wear of ripper and scraper
    • Design diagram of optimized ripper and scraper
    • Comparison of wear conditions of high and low rippers on same trajectory

    Tables of the Article

    • 粒径/mm 60~120 40~60 20~40 < 20
      质量百分比/% 6.9 11.6 24.4 57.1
      Proportion of soil with different particle sizes
    • 接触部位 参数
      静摩擦系数 滚动摩擦系数 恢复系数
      颗粒-加载盘 0.7 0.001 0.25
      颗粒-边界墙 0.7 0.001 0.25
      颗粒间 0.8 0.04 0.75
      Contact parameters
    • 接触部位 参数
      剪切模量/Pa 密度/(kg·m-3) 泊松比
      盾构机 7.9×1010 7800 0.25
      边界墙 7.9×1010 7800 0.25
      卵石颗粒 1.12×107 2200 0.27
      Material parameters
    • 刀盘直径/
      m
      掘进速度/
      (m·s-1)
      刀盘转速/
      rpm
      螺旋输送机转速/
      rpm
      9.0 1.33×10-3 2.8 5.5
      Parameters of shield tunneling
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