Studies on the disturbed state concept constitutive model of the rockfill materials

摘要

Based on the Disturbed State Concept (DSC) which was suggested by C.S. Desai for sand clay, an elastoplastic constitutive model is developed in order to precisely reflect the complicated mechanical behavior of rockfill materials in this paper. The major works are as follows: (1) the full adjusted state of rockfill materials is appropriately characterized as critical state, according to evolution character of internal microstructure of rockfill materials, considered the effect of plastic volumetric strain in disturbance function reflect barotropy property of rockfill materials. (2) according to large-scale triaxial test date, suggested the parameter determination methods of constitutive model. (3) numerical calculation were verified and compared with the date from triaxial compression tests of rockfill materials for one national projects, the results show that the DSC model can simulated some main mechanical properties of rockfill materials, such as nonlinearity, barotropy, dilatancy and grain fracture, and can characterize the effect and evolution process for stress and deformation of granular materials in complex stress path.