Research on parabolic yield-surface creep constitutive model of artificial frozen soil

The triaxial creep experiment of artificial frozen soil in deep alluvium is performed by using self-developed a W3Z-200 apparatus of triaxial creep frozen soil.Analyzing the experiment results,applying parabolic yield criterion for improved viscoplasticity in the Nishihara model and coupling degree of temperature,a new creep constitutive model is established for describing frozen-soil's creep characteristics under the complicated stress state.The model is embedded in nonlinear ADINA finite element program in order to numerically analyze easily.Numerical simulation of the shaft well excavation process and field measurements of deformation of deep soil frozen wall are performed in Huainan Mine;and the results show that the established parabolic yield-surface constitutive model is correct and reasonable for FEM numerical simulation of deep soil frozen wall.