Classical pavement-subgrade system analysis is based on multi-layer linear elastic analysis, infinite pavement layer dimensions and a semi-infinite subgrade. The improper interface condition of the binder-stabilized base layer has little influence on moduli of asphalt and subgrade layer. BACKCALCULATION OF LAYER MODULI, STATIC AND DYNAMIC FEATURES.
#Backcalculation of layer moduli full
The analysis results demonstrate that assuming full bonding, instead of actual interface conditions of asphalt-stabilized base layer, moduli of stabilized base layers is underestimated, up to 2.5 times smaller than the original values. The ANN is observed to backcalculate layer moduli, both from normal. Finally, the backcalculated layer moduli and the original moduli values were compared. An artificial neural network (ANN) is used as a tool for backcalculation in this work. of calculating pavement layer moduli is the backcalculation of moduli from. Secondly, different friction coefficient values between asphalt layer and stabilized base layer were introduced into dynamic finite element model, accordingly, deflection basin parameters were calculated and layer moduli are determined based on the established regression functions. BACKCALCULATION OF UNBOUND GRANULAR LAYER MODULI Executive Summary Gilbert Baladi, Ph.D., P.E. The resilient moduli for the asphalt and soil layers of pavement sections are. Then, the regression functions between deflections basin parameters and layer moduli were created and used to backcalculate layer moduli. The backcalculation of pavement layer moduli from Falling Weight Deflectometer (FWD) measured surface deflections is a challenging task. Firstly, according to the full bonding hypothesis, a dynamic finite element analysis model was established to generate a synthetic surface deflection database of the semi-rigid asphalt pavements. The objective of this study was to analyze the errors in layer moduli backcalculation due to modeling of layer interface condition. To make appropriate rehabilitation decisions, determining structural layer moduli of the existing semi-rigid asphalt pavements is a crucial task for highway engineers. calculating Layer Moduli, Nondestructive Testing of Pavements and Backcalculation of Mod- uli, ASTM STP 1026, A.
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