Abstract:

As a powerful universal finite element analysis program, ABAQUS possesses immense ability for nonlinear computing, pre-and-post-processing. But the constitutive model of soil adopted in standard ABAQUS is inadequate in terms of the inability of reflecting militancy of cohesive soil, strain-softening and hardening of sand as well as the impact of stress path on deformation, etc. So it became an emergency for new constitutive model library which is more suitable for soil to be added into ABAQUS. In order to enlarge the computing ability of ABAQUS in the area of geotechnical engineering, new constitutive model library such as Duncan-Chang model, NHRI model and Sand model which are more adaptive for engineering application were developed with the help of secondary development toolkit UMAT as well as data interface. In this way, the convenient pre-and-post-processing and powerful nonlinear solving platform were made full use of in the study, and that more pertinent and more realistic finite element calculation for the stress and strain in soil can be accomplished, which is able to provide technique support for engineering practice. A numerical example is given; and the results verity that the second development of constitutive model library is valid.

Key words: soil constitutive model library, ABAQUS, secondary development, soil triaxial compression tests