As most previous studies have neglected the positive influence of salinity (osmotic suction) on most coastal soils in Australia, the design of transport infrastructure involving these soils have often been overly conservative. In this study, a laboratory approach based on direct shear testing is explained to determine the stress-strain behaviour of compacted coastal silty clay (CL) at different levels of osmotic suction generated by varying salinity (NaCl) concentrations. A broad data set for a total of 147 direct shear tests conducted on remoulded and re-compacted test specimens at seven different initial matric suction conditions is analysed to develop a semi-empirical model that captures the effect of osmotic suction on the soil shear strength. The results suggest that greater the initial matric suction is the more pronounced will be the role of osmotic suction. The proposed semi-empirical model is governed by an electrical conductivity relationship with the osmotic suction generated by soil salinity. A new parameter is introduced to quantify the role of soil salinityon the apparent soil shear strength corresponding to different levels of osmotic suction. When this novel relationship is coupled with the conventional matric suction theory, the overall unsaturated shear strength of a saline soil can be properly evaluated, as proven by the close proximity of the predictions to the measurements.
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