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Dynamic Interpretation for Impulsive Deflection Test on Flexible Pavements

Published online by Cambridge University Press:  05 May 2011

Der-Wen Chang  and
Chia-Ling Chang
Der-Wen Chang*
Affiliation:
Department of Civil Engineering, Tamkang University, Tamsui, Taiwan 25137, R.O.C.
Chia-Ling Chang*
Affiliation:
Department of Civil Engineering, Tamkang University, Tamsui, Taiwan 25137, R.O.C.
*
*Associate Professor
**Graduate Research Assistant
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Abstract

In this study, a computer program DBFWD is developed for data analysis of Falling Weight Deflectometer (FWD) test on flexible pavements. To backcalculate the layer moduli of the pavement, a number of iterative backcalculation schemes were employed with the forward analysis of the Green's flexibility influence functions. The temperature and the moisture influences on material moduli of the asphalt surface and the subgrade soils were considered in the analysis. As the result, the iterative scheme based on the peak deflection ratios was selected to backcalculate the layer moduli of local pavements. Owing to the correction procedure used in the program, interpretations with four original deflections were found more accurate than those with equivalent number of modified deflections. Comparisons of program DBFWD with other static backcalculation programs on theoretical and experimental deflections indicated that dynamic interpretation is more effective in providing the layer modulus information. Despite of the requirements of accurate inputs of the layer thickness and the testing load for the analysis, a generalized application of the program needs to be clarified with model road test in demand.

Keywords

Impulsive testsDeflectionDynamic analysisData interpretationPavement.
Type
Articles
Information
Journal of Mechanics , Volume 14 , Issue 2 , June 1998 , pp. 91 - 100
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 1998

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