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    WGD-501 vertical freeze-thaw machine

     
    2023, 45(4): 805-815.
    Mechanical properties of sandstone under freeze-thaw cycles and studies on meso-damage constitutive model .

    Figures of the Article

    • Freeze-thaw test block of sandstone
    • TZW-3000II rock true triaxial rheological testing machine
    • WGD-501 vertical freeze-thaw machine
    • Variation of mass change rate with temperature of freeze-thaw cycle
    • Variation of change rate of longitudinal wave velocity with temperature of freeze-thaw cycle
    • Surface microstructures of sandstone in natural state and after 80 freeze-thaw cycles
    • Stress-strain curves under different confining pressures and freeze-thaw temperatures
    • Fitting curves of porosity with number of freeze-thaw cycles
    • Peak points of experimental and theoretical curves under different confining pressures after 0 freeze-thaw cycle
    • Peak points of experimental and theoretical curves under different confining pressures after 5 freeze-thaw cycles
    • Peak points of experimental and theoretical curves under different confining pressures after 10 freeze-thaw cycles
    • Peak points of experimental and theoretical curves under different confining pressures after 20 freeze-thaw cycles
    • Peak points of experimental and theoretical curves under different confining pressures after 40 freeze-thaw cycles

    Tables of the Article

    • 冻融循环次数 0 5 10 20 30 40 50
      孔隙率ϕn/% 5.58 5.76 6.06 6.20 6.33 6.43 6.76
      NMR porosities of rock samples under different freeze-thaw cycles
    • 冻融循环次数 10 30 50 70
      孔隙率ϕn/% 2.83 4.09 7.43 10.13
      NMR porosities of rock samples
    • 冻融循环次数 0 5 10 20 40
      孔隙率拟合值/% 2.062 2.355 2.83 3.502 5.662
      Fitting values of NMR porosity of rock samples under different freeze-thaw cycles
    • 冻融次数 σ3/MPa σp /MPa εp /% m F0/MPa
      0 0 4.230 0.4 4.634 1.987
      2 14.572 1.1 6.869 3.369
      4 19.652 1.3 17.460 3.383
      6 24.866 1.6 25.257 3.406
      5 0 4.020 0.5 3.127 1.653
      2 13.101 1.1 6.556 3.120
      4 19.132 1.3 13.958 3.113
      6 24.347 1.7 10.828 3.607
      10 0 3.800 0.5 3.225 1.651
      2 12.701 1.1 4.287 3.124
      4 18.910 1.5 5.562 3.602
      6 23.519 1.9 5.116 3.880
      20 0 3.749 0.6 3.007 1.466
      2 11.356 1.2 2.701 2.678
      4 18.100 1.8 2.887 3.591
      6 22.903 2.1 3.499 4.031
      40 0 3.301 0.6 1.286 0.836
      2 10.570 1.5 1.408 2.197
      4 17.121 1.9 2.367 3.492
      6 21.274 2.5 2.121 3.722
      Model parameters of red sandstone under different freeze-thaw cycles and confining pressures

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