Investigation On Constitutive Model Artifical Frozen Soil Of High Stress And Engineering Application

A lots of frozen clay specimens are used for carrying out the long-term creep tests under single-axial stress states. Using the non linear N element replace the linear one, Therefore Xiyuan Model is improved . according to the improved Xiyuan Model is proposed to describe the triaxial nonlinear creep constitutive function . A dopting D-P yield .model a soft matrix is derived to use numerical calculating , the plane FEM program which can simulate the frozen soil , The improved Xiyuan Model constitutive model for geo-materials is embeded into the commercial FEM software ADINA as a users subroutine ,. By tri-axial stress states creep trials , the final fiting curves and the theory calculation indicate that the theoretical results coincide with the experimental ones very well. The model is of the feature of the non-linear accelerative creep of frozen soil.Regard as frozen wall as uniform media By means of the improved Xiyuan Model analysis, a formula is derived to calculate the stress and displacement field of frozen wall Making using of the determined temperature field, regarding frozen soil as improved Xiyuan Model , considering the affection of the excavation of top place, using ADINA finite element program, analyzing thermo-mechanical coupling of frozen wall, radial displacement distribution rules of sidewall and the stress field of frozen wall are got.By calculating and analyzing , applying the improved Xiyuan Model, the paper presents the distribution rules of temperature field and stress field and displacement field of frozen wall under three rows of freezing pipes,and corresponding to engineering reality , which can be taken as reference for practical engineering.