Several models/equations that use the information obtained from tests such as soil water retention curves and shear strength on saturated soil, had been proposed and validated in past to predict the shear strength of unsaturated soils. However, the accuracy of these models is rather limitedly confirmed over narrow range of soil suction. In this research axis-translation and relative-humidity techniques were used to apply and control matric and total soil suction, respectively within test specimens. Two models proposed by past researchers were selected and used in predicting the non-linear increase in shear strength with increasing values of soil suction and then compared with experimental values that were obtained from current research. It was observed that the experimental data and model predictions at critical state failure fit decently well and gave a good correlation value using both models. In addition, there was a smooth transition of suction strength prediction beyond residual suction.
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