Prediction of stress strain response by Rotational multiple Yield Surface Framework for unsaturated granite residual soil

• Published in: Unsaturated Soils: Research and Applications - Proceedings of the 6th International Conference on Unsaturated Soils, UNSAT 2014
• Main Author: Md. Noor M.J.; Mohamed Jais I.B.
• Format: Conference paper
• Language: English
• Published: Taylor and Francis - Balkema 2014
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84901624522&partnerID=40&md5=e675da775bb643fc9397bbdbc6a33310

If prediction of settlement can be done directly from soil stress-strain curve then it would be the ultimate approach. However a stress-strain curve is only representing a specific value of effective stress and could not represent the behaviour at any other effective stresses. A method known as Rotational Yield Surface Framework (RMYSF) has been developed which allow the prediction to be valid over the whole range of effective stresses. The framework characterizes the stress-strain response of a soil from the interaction between mobilized shear strength envelope and the subjected effective stress whereby the characteristic of the former is defined from the stress-strain curves at various effective stresses. There exist a unique relationship between the state of mobilized shear strength i.e. minimum mobilised friction angle, φminmob and the state of strain irrespective of the state of effective stress. Thence this allows the prediction of stress-strain response for saturated and unsaturated soils from the established state of mobilized shear strength envelope. Triaxial tests have been conducted for saturated and unsaturated granite residual soils and the evidence of elasto-plastic behaviour will be presented from the concept of effective stress and shear strength interaction with the establishment of the unique relationship between minimum mobilised friction angle against axial strain. The simulation of RMYSF to predict the stress-strain response of saturated and unsaturated granite residual soil will be presented. © 2014 Taylor & Francis Group, London.