Models to estimate k subgrade reaction modulus values based on deflection basin parameters

• Autores: Carlos Yukio Suzuki, C.R.G. Santos, Marcela S. Ferri, F.M. Lopes, R.T.G. Cruz, A.M. Azevedo
• Localización: Bearing capacity of roads, railways and airfields: proceedings of the 8th International Conference on the Bearing Capacity of Roads, Railways and Airfields, Champaign, Illinois, USA, June 29-July 2, 2009 / Erol Tutulumluer (dir.), Imad L. Al-Qadi (dir.), Vol. 1, 2009, ISBN 9780415804325, págs. 571-579
• Idioma: inglés
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• Resumen

  • The structural design of concrete pavements according to AASHTO and PCA methods makes use of modulus of reaction (k) from the subgrade and subbase/subgrade system as parameter to calculate slab thickness. Conventionally, the k-values must be determined through NDT testing that is expensive and lengthy. The objective of this paper is to present a correlation between k-values and deflection measurements, which are easier and cheaper to obtain; thereby giving the inspector a faster method to determine and check the desired k-values. The correlations are results of a computer simulation with the ELSYM-5 software program. The resulting models from the maximum deflection and area parameter had good results, unlike the radius of curvature. These models provide improved ability and agility in the evaluation of subgrade layers and the subbase of concrete pavement, when compared to the plate bearing test.