![]() Modulus is estimated for each program and pavement type. A correction factor for backcalculated subgrade The results indicate that the three programs haveĪn excellent capability of predicting the FEM-generated subgrade modulus values for flexible, composite, and rigid pavements provided that aĬorrection factor is used. Obtained from three backcalculation programs: MODCOMP, MODULUS, and EVERCALC. Theīackcalculated moduli using 3D FEM are compared with the results Matched by adjusting the values of layer moduli used in the FEM. The FWD-measured and FEM-generated deflection basins are Interfaces, and the 3D geometrical characteristics of the pavement structure. ![]() The falling weight deflectometer (FWD) load, friction at pavement-layer ![]() The modeling approach accounts for the dynamic nature of Three-dimensional (3D) finite-element model (FEM) is used to backcalculate the layer moduli of rigid, flexible, and composite pavement To the inability of replicating in laboratory tests the same consolidationĪnd stress conditions encountered in the field. Performance Evaluation of BackcalculationĬurrently, the only means of assessing the performance of a backcalculation algorithm is to compare its results with the values obtained through
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