The resilient modulus, M R, of subgrade soils had been used extensively as an important unbound material property in the pavement design and analysis. The stress state and the humidity of cohesive soils have significant impacts on the resilient modulus. To predict the resilient modulus of cohesive soils in South China, the material indicator tests, an improved repeated load triaxial test and the pressure plate test were carried out. Then the SWCC was described using the Fredlund and Xing’s model with a relatively high coefficient of determination. Subsequently, the variation of resilient modulus with the stress state and the humidity characterized by the matric suction for cohesive soils were evaluated. A correlation between the matric suction and resilient modulus of cohesive soils was built, which has high correlation coefficients. In the following, a new resilient modulus estimation model for cohesive soils in South China incorporating the stress state and matric suction was proposed, which has a simple form, less parameters and only requires a universal triaxial testing system. After that, the new model was verified using the data of different cohesive soils from existing literature. The results show that the developed model has a high prediction accuracy.
International Journal of Civil Engineering – Springer Journals
Published: May 30, 2018
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