抄録
A simple and general elastoplastic constitutive model for clay is proposed that describes the stress-strain behavior of clay under various stress paths in three-dimensional stresses. This model takes into account precisely not only the influence of the intermediate principal stress on the strength and deformation characteristics of clay but also the influence of the stress path on the deformation characteristics of clay. The former influence is considered by using the mechanical quantity tij which is a generalized idea of the extended concept of "Spatially Mobilized Plane" (briefly SMP*), and the latter influence by dividing the plastic strain increment into two components regardless that only a yield function and a strain hardening parameter are employed. Furthermore, the soil parameters of the proposed model are easily determined in the same manner as the well-known Cam-clay model.The validities of the proposed model are checked by analyzing various element tests on clay under triaxial compression, triaxial extension and plane strain conditions and comparing these analytical results with the experimental results.
