ELSTOPLASTIC MODEL FOR SOILS INTRODUCED TH POWER RULE OF LOGARITHM VOID GRADIENT

Abstract

The elastoplastic model for soils introduced the power rule of logarithm void gradient into the hardening law of Cam-clay model instead of the compression index is presented. The model would contribute to the improvement of prediction accuracy of the elastoplastic model with the compression index as the hardening law, because the power rule of logarithm void gradient accurately and reasonably predicts the compressibility for soils over a wide range in stress. Furthermore, the soils with any void ratio deviated from the steady state (critical state) for shear are described in the novel logarithm void strain relative to that of the steady state and then the proper evolution law is introduced. The model is capable of describing the dilatancy to translate any void ratio with shear into that of the steady state.