This paper introduces an improved best fit back-calculation technique basedon deflection predictions obtained using finite element method (FEM) simulationsthrough EverFE of the actual slab configuration, rather than generic theoreticaldeflection predictions. It is based on minimizing the squared error between FWDmeasured deflections and FEM predicted deflections. It assumes that the modulus ofthe concrete is known, (i.e., it can be readily obtained through relatively inexpensiveshear wave propagation techniques) and gives a closed-form solution for the modulusof subgrade reaction. The results of this method were compared to the ones obtainedby the LTPP best-fit method, using as a reference the LTPP database subgradereaction moduli values obtained from plate loading tests. The results suggest that theproposed method improves on the traditional best-fit back-calculation technique.
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