Semi-Flexible Pavement Structure Analysis Based on Double Modulus Theory

Authors

PAN Qinxue, School of Transportation , Changsha University of Science & Technology , Changsha , Hunan 410114 , China ;National Engineering Research Center of Highway Maintenance Technology , Changsha University of Science & Technology , Changsha , Hunan 410114 , ChinaFollow
ZHOU Shurui, School of Transportation , Changsha University of Science & Technology , Changsha , Hunan 410114 , China
HU Jia, School of Transportation , Changsha University of Science & Technology , Changsha , Hunan 410114 , China
ZHANG Long, School of Transportation , Changsha University of Science & Technology , Changsha , Hunan 410114 , China
SONG Xiaojin, Zhongteng Zhixin Technology (Hunan ) Co., Ltd., Changsha , Hunan 410036 , China
LIU Hongfu, School of Transportation , Changsha University of Science & Technology , Changsha , Hunan 410114 , China ;National Engineering Research Center of Highway Maintenance Technology , Changsha University of Science & Technology , Changsha , Hunan 410114 , China

Abstract

Semi-flexible pavement materials have significant differences in tension and compression.If the mechanical response analysis of pavement structures is conducted by using the traditional linear elastic theory with a single modulus,there will be a considerable deviation from actual situations.To analyze and optimize semi-flexible pavement structures,this paper compared the changes in key mechanical responses of pavement structures under six different semi-flexible layer positions and thickness combinations based on the double modulus theory.The results show that there is a significant difference in the calculation results of key mechanical responses of the pavement based on the double modulus theory and the single modulus theory,with the difference in the maximum longitudinal tensile strain of the pavement being the most significant (over 60%).Compared to other layer combinations,when the upper or middle layer is composed of a semi-flexible pavement material,the surface deflection is larger,and the overall stiffness of the pavement structure is smaller.When the middle-lower,lower,or upper-middle-lower layers contain semi-flexible pavement materials,the tensile stress at the bottom of the lower layer is high,which makes it prone to cracking.When the middle-upper layers contain semi-flexible pavement materials,the critical mechanical response is relatively small,and it is recommended that the upper-middle layer be the optimal application layer.A model for the relationship between the key mechanical responses and the thickness of the semi-flexible layer was established.The maximum tensile stress on the road surface is most significantly affected by the thickness of the semi-flexible layer (up to 64%).When the semi-flexible material is applied to the upper-middle layers,the optimal thickness range is 10–12 cm.The research results can provide reference for the design of semi-flexible pavement structures considering the differences in tension and compression.

Publication Date

6-23-2025

DOI

10.14048/j.issn.1671-2579.2025.03.009

First Page

74

Last Page

82

Submission Date

August 2025

Recommended Citation

Qinxue, PAN; Shurui, ZHOU; Jia, HU; Long, ZHANG; Xiaojin, SONG; and Hongfu, LIU (2025) "Semi-Flexible Pavement Structure Analysis Based on Double Modulus Theory," Journal of China & Foreign Highway: Vol. 45: Iss. 3, Article 9.
DOI: 10.14048/j.issn.1671-2579.2025.03.009
Available at: https://zwgl1980.csust.edu.cn/journal/vol45/iss3/9

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