Effective Stress Nonlinear Model Parameters and Simulation of Stress-strain for Expansive Soil
An experimental investigation of the stress-strain and volume change behaviour of normally consolidated expansive (Barind) soil characteristics are studied using a computer controlled triaxial cell. This paper presents a procedure for estimating the effective nonlinear stress-strain parameters for Barind soils from the results of triaxial, consolidation and direct shear tests. In this study compacted soil is tested to different stress level. Since field tests are very costly, it is essential to develop suitable model parameters to predict the behaviour of Barind soils based on the triaxial, consolidation and direct shear tests. From the results of the drained triaxial compression tests, the Young’s modulus and modulus exponent, defined for their dependencies on shear stress level and strain rate were quantified. A procedure for estimating the bulk modulus number, the bulk modulus exponent and the unload-reload modulus number is also presented. Finally, a comparison is made between the predictions and experimental results using model constants and the predictions are found to be satisfactory.