E. Taheri - PhD Student. Civil department, K. N. Toosi University of Technology
S. A. Sadrnejad - Professor, Civil department, K. N. Toosi University of Technology

In present paper Multiplane unified model for clay and sand incorporating strain anisotropy is presented. This model is relied on critical state concept. Bounding surface plasticity is also applied due to better prediction of cyclic behavior of soil. In order to consider anisotropy, 17 planes are adopted in related directions. Considering 17 planes not only satisfy stress equilibrium but also meet compatibility condition. The result shows good agreement between experimental results and Multiplane model. Present model is also capable of predicting shear band and fracture direction in soil with cyclic loading. Moreover regarding its unified nature it can be applied for highly heterogeneous soil via considering different parameters in different planes.

Multiplane, induced anisotropy, bounding surface, cyclic loading