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Corresponding Author

朱浩然, 男, 博士, 副教授. E-mail: dndxzhr@hhu.edu.cn

Abstract

Traffic speed deflectometer (TSD) has been widely used in pavement maintenance, yet an indicator system for identifying layer-specific structural strength remains lacking. On the basis of a three-dimensional finite element model incorporating viscoelastic damage, this study analyzed how surface damage density and the modulus of the base and subbase affect deflection slope. Two layer-sensitive indicators of structural strength were proposed:S10 (deflection slope 10 cm ahead of the load center) for characterizing the surface layer, and S30 (deflection slope 30 cm ahead of the load center) for reflecting the structural strength of the base layer. Simulation results show that S10 is highly sensitive to surface damage, with maximum variation amplitude exceeding 600%. S30 correlates strongly with base modulus changes, exhibiting excellent recognition capability. Measured TSD data from a typical expressway were used to validate the indicators. The results indicate that S10 and S30 exhibit distinct layer response characteristics, enabling effective differentiation of different lane conditions. The research provides a new path for mechanical interpretation of raw TSD data and establishes an applicable parameter system and a theoretical basis for evaluating the layer-specific structural strength of asphalt pavement.

Publication Date

10-27-2025

DOI

10.14048/j.issn.1671-2579.2025.05.008

First Page

75

Last Page

83

Submission Date

November 2025

Reference

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