Journal Published Online: 25 April 2022
Volume 50, Issue 4

Modulus Back-Calculation of Four-Layer System Based on the Characteristic Parameters of Deflection Basin

CODEN: JTEVAB

Abstract

Falling weight deflectometer (FWD) is the most widely used nondestructive testing method for pavement structure. The back-calculation of structural modulus based on the deflection basin is an important approach to evaluate the service state of pavement structure and study the evolution law of its behavior. Although the deflection of pavement can be approximated as elastic deformation by the instantaneous impact load in FWD testing, the nonlinear response characteristics of structure and materials are non-negligible, which brings difficulties to the modulus back-calculation for a multilayer system. This paper proposes a new back-calculation method of the four-layer structure, which is based on the linear elastic layered mechanical system, through analyzing the empirical relationship between the geometric characteristics of the measured deflection basin and the corresponding moduli of the structural layers. In addition, the feasibility and reliability of this method are evaluated by using the FWD data of the representative structures in the RIOHTrack test road.

Author Information

Liu, Xu
Fundamental Research Innovation Center, Research Institute of Highway Ministry of Transport, Beijing, China
Wang, Xudong
Fundamental Research Innovation Center, Research Institute of Highway Ministry of Transport, Beijing, China
Wu, Yang
Fundamental Research Innovation Center, Research Institute of Highway Ministry of Transport, Beijing, China
Zhou, Xingye
Fundamental Research Innovation Center, Research Institute of Highway Ministry of Transport, Beijing, China
Pages: 19
Price: $25.00
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Details
Stock #: JTE20210717
ISSN: 0090-3973
DOI: 10.1520/JTE20210717