Application of the Continuous Critical State Model in Axisymmetric Problem Cheng Y. M. (Department of Civil and Structural Engineering, Hong Kong Polytechnic) Tsui Y. (Department of Civil and Structural Engineering, University of Hong Kong)

The authors have proposed a continuous plasticity version of the critical state model which is an improvement of the soil model as proposed by Naylor. In the present model, the stresses to be used are based on the Cambridge stress convention which have considered the effects of the intermediate principal stress as compared with the original model which is based on the MIT stress convention.The authors have also proposed a simple and direct method for the determination of the conjugate point and the cut-off point from the ellipse shape state boundary surface. The proposed model has many advantages over the original modified Cam-Clay model and is suitable for use in many types of geotechnical problems.