A FLAC3D grid can be configured for both a creep calculation and a dynamic calculation. The procedure and method of implementing an interface constitutive model into a commercial computer program also provide a reference for implementation of a new interface constitutive model in FLAC 3D. Using the above nonlinear creep constitutive model (as shown in formula 1), the numerical simulation uniaxial compression creep test of rock specimen was demonstrated by the FLAC3D software. WIPP-creep viscoplastic model a power-law viscoplastic model and a crushed-salt constitutive model. The results confirmed the validity and reliability of the improved interface model. The procedure and method of implementing an interface constitutive model into a commercial computer program also provide a reference for implementation of a new interface constitutive model in FLAC3D Publisher: Production and hosting by Elsevier B.V. Results of the numerical tests show good agreement with the results obtained from theoretical calculations, indicating that the model incorporated into FLAC3D can simulate the nonlinear strain-softening behavior of interfaces involving geosynthetic materials. A numerical simulation of a direct shear test for geosynthetic interfaces was conducted to verify that the interface model was implemented correctly. In order to simulate the strain-softening characteristics of interfaces, a nonlinear strain-softening interface constitutive model was incorporated into fast Lagrange analysis of continua in three dimensions (FLAC 3D) through a user-defined program in the FISH environment. Due to the complexity of soil-structure interaction, simple constitutive models typically used for interface elements in general computer programs cannot satisfy the requirements of discontinuous deformation analysis of structures that contain different interfaces.

Flac3d units constitutive model