Development and implementation of Duncan-Chang constitutive model in GeoStudio2007

The software package of GeoStudio, which is developed and supported by GEOSLOPE inc., is one of the most popular software package in the field of geotechnical engineering. However, the software SIGMA/W for deformation and stresses computing currently absents Duncan-Chang E-B constitutive model that has been widely used in the domestic field of geotechnical engineering. The shortage limits the software's application scopes. In this paper, with the further developing platform, Duncan- Chang E-B constitutive model is developed in GeoStudio2007 with C# environment, and the stress level, which is often used in the result analysis, is connected to the post processor. Through a series of numerical simulation of routine and stress path triaxial compression test, the correctness of the compiled model is verified. Through a stress level computing of a stage constructed dam, the goodness of connection between the model and the post processor is verified. According to the experience of developing Duncan-Chang E-B constitutive model, this paper shows the basic procedures, programming essential and connecting with post processor for constitutive model developing in GeoStudio2007, and this supplies a reference for other developers to build a user-defined constitutive model.