American Society of Civil Engineers


Assessment of Influence of Soil Properties on Subgrade Stiffness Using the Long Term Pavement Performance Data


by Yong An Lee, (Post Doctor, Geotechnical Engineering Research Division, Korea Institute of Construction Technology,1190 Simindae-ro, Goyang 411-712, Korea E-mail: ey4906@kict.re.kr) and Moonkyung Chung, M.ASCE, (Research Fellow, Geotechnical Engineering Research Division, Korea Institute of Construction Technology, 1190 Simindae-ro, Goyang 411-712, Korea E-mail: mkchung@kict.re.kr)
Section: Geotechnical Inputs to Mechanistic-Empirical Pavement Design, pp. 1523-1531, (doi:  http://dx.doi.org/10.1061/9780784412121.157)

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Document type: Conference Proceeding Paper
Part of: GeoCongress 2012: State of the Art and Practice in Geotechnical Engineering
Abstract: The subgrade stiffness is essential for pavement design and evaluation. This paper presents the effect of various soil properties on the subgrade stiffness in the field. Data was extracted from the Long Term Pavement Performance (LTPP) Seasonal Monitoring Program (SMP) database. In this study, the subgrade stiffness was characterized by the Base Curvature Index (BCI), and the subgrade modulus calculated through the backcalculation process. Passing the #200 sieve, maximum dry density and water contents as soil properties were selected to associate with the subgrade stiffness characterization. It was found from this study that the BCI and subgrade modulus are highly correlated with soil properties. It was also observed that the water content is the most significant parameter determining the subgrade stiffness.


ASCE Subject Headings:
Soil properties
Subgrades
Stiffness
Pavements