Effect of the Field-Stress State on the Subgrade Resilient Modulus for Pavement Rutting and IRI

The new Mechanistic-Empirical Pavement Design Guide (MEPDG) uses the subgrade resilient modulus (MR) as key input parameter to represent soil behavior for pavement design. increases with an increase in confining pressure, whereas, deviatoric stress, it granular soils and decreases fine-grained soils. value of MR is highly stress dependent, state (i.e., bulk stress) a function position materials structure applied traffic loading. Applying excessive vertical at top without knowing appropriate can result permanent deformation. In situ must be calculated so correct determined. To facilitate implementation MEPDG, this study develops methodology select predicting rutting IRI. A comprehensive research was undertaken effect or undisturbed on performance using MEPDG. Results show that obtained from approximately 1.4 times higher than estimate NCHRP-285. Thus, significantly affects calculation and, subsequently, use predicted rutting, IRI AASHTOWare mechanistic-empirical also sections were classified “Good” “Fair” conditions IRI, respectively, considering MR.