Mechanical Behavior and Theoretical Simulation of Post-Liquefied Sand in Fluid-Solid Transition Process

Abstract:

Post-liquefied sand flow involves a phase transition process from fluid to solid. To overcome the limitation of normal triaxial loading mode for loose sand， a two-staged loading method， stress- and strain-controlled loading， was applied to obtain the initial liquefaction state and investigate the mechanical behavior in the post-liquefaction process. Based on test results， a fluid-solid transition parameter was proposed to combine solid and fluid constitutive models. Finally， the stress-strain relation of post-liquefied sand was established to simulate the fluid-solid transition process at different relative densities.