Modeling the static liquefaction of unsaturated sand containing gas bubbles

摘要: Abstract As a modification of the deviatoric hardening plasticity model, material state-dependent model was proposed to simulate response unsaturated sand containing gas bubbles under undrained triaxial conditions. Affected by compressibility gas, stress paths conditions approach drained when initial degree saturation is low. Upon an increase in saturation, path gradually approaches saturated response. According prediction based on second-order work criterion, static liquefaction occurs loose sand, but not dense sand. Increases and pressure reduce ratio at instability points. The line obtained connecting those points p-q space nonlinear, its slope depends void ratio, pressure, confining stress. After comparing experimental results literature with theoretical prediction, shown precisely predict onset bubbles.