|Table of Contents|

Nonlinear mechanical behavior of granular base asphalt pavement structure under action of temperature and moisture(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2024年1期
Page:
24-35
Research Field:
道路工程
Publishing date:

Info

Title:
Nonlinear mechanical behavior of granular base asphalt pavement structure under action of temperature and moisture
Author(s):
HUANG You1; 2;  PAN Yu2;  XIAO Bin3;  LIU Zhao-hui2;  ZHANG Yun-bao3
(1. Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road & Traffic Safety of Ministry of Education, Changsha University of Science & Technology, Changsha 410114, Hunan, China; 2. School of Traffic and Transportation Engineering, Changsha University of Science and Technology,Changsha 410114, Hunan, China; 3. Transportation Construction Cost Management Station, Department of Transportation of Hunan Province, Changsha 410011, Hunan, China)
Keywords:
road engineering;  asphalt pavement;  finite element;  granular material;  resilient modulus;  pavement structure mechanical behavior;  non-linear
PACS:
U416
DOI:
10.19721/j.cnki.1671-8879.2024.01.003
Abstract:
In order to study the nonlinear mechanical behavior of road structure under the action of temperature and moisture, temperature and moisture combinations of granular base asphalt pavement were constructed based on the long term measured data of temperature and moisture. Nonlinear resilient modulus model for granular base and subgrade were constructed, considering the influence of both moisture and stress. Two asphalt layer thicknesses and two load levels were designed, and finite element method was used to conduct the nonlinear structure mechanical behavior analysis of asphalt pavement with granular layer and soil subgrade. Based on Miner's damage rule, the fatigue life regarding tensile strain at the bottom of asphalt layer and compressive strain at the top of subgrade were calculated. The results show that the Uzan three-parameter model considering the moisture adjustment can well characterize the nonlinear mechanical behavior of the asphalt pavement granular base and subgrade in service. There are significant differences between nonlinear mechanical analysis and layered elastic analysis, for instance, the tensile strain at the bottom of asphalt layer and the compressive strain at the top of subgrade, and their sensitivities to temperature and moisture changes. The service life of the pavement is also quite different. The influence of temperature and moisture on the mechanical behavior of road structure shouldn't be ignored. Increasing the load or reducing the thickness of the asphalt surface layer will increase the structural response of asphalt pavement and reduce the service life, but the mechanisms lie behind are different. The stress hardening characteristics of unbound aggregate can alleviate to an extent the tensile stress at the bottom of asphalt surface layer.5 tabs, 13 figs, 26 refs.

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Last Update: 2024-01-10