Modeling Resilient Modulus of Granular Subgrade Soil


Abdulrahman Al-Suhaibani

College of engineering, King Saud University, Riyadh, Saudi Arabia



Since resilient modulus (MR) of unbound pavement materials is highly dependent on stress conditions, mathematical modeling of MR is usually based on bulk stress, as recommended by AASHTO 294-92I test. One major limitation of the bulk stress model is that it provides identical resilient properties for identical bulk stresses obtained either from high confining and low deviator stresses or from low confining and high deviator stresses. Thus, this model does not distinguish between the effect of confining and deviator stresses. However, other models that could be used to model MR have been reported in the literature. In this paper, several linear and non-linear mathematical models were compared based on their ability to model MR results. The model that contains both confining and deviator stresses was found to be the best among the investigated models. Ranking of other models was, also, reported.

Keywords: Resilient Modulus, Subgrade, Granular Soil.

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