考虑温湿度作用的粒料基层沥青路面结构非线性力学行为
Nonlinear mechanical behavior of granular base asphalt pavement structure under action of temperature and moisture
黄优 1潘宇 2肖滨 3刘朝晖 2张允宝3
作者信息
- 1. 长沙理工大学道路灾变防治及交通安全教育部工程研究中心,湖南长沙 410114;长沙理工大学交通运输工程学院,湖南长沙 410114
- 2. 长沙理工大学交通运输工程学院,湖南长沙 410114
- 3. 湖南省交通运输厅交通建设造价管理站,湖南长沙 410011
- 折叠
摘要
为了研究温湿度作用下道路结构非线性力学行为,基于长期性能观测构建粒料基层沥青路面的温湿度组合,建立综合考虑应力和湿度影响的粒料非线性回弹模量模型,考察2个沥青层厚度和2个荷载水平,利用有限元开展沥青路面粒料层和土基非线性结构力学行为分析,基于Miner's损伤法则,计算基于沥青层底拉应变和土基顶部压应变的疲劳寿命.研究结果表明:采用考虑湿度调整的Uzan三参数模型能够较好地表征在役沥青路面粒料层和土基的非线性力学行为;非线性路面结构分析与现有线弹性路面结构计算相比,沥青层底拉应变和土基顶部压应变大小及其对温湿度变化的敏感程度均存在显著差异,结构寿命也相差较大,温湿度对道路结构力学行为的影响不容忽视;增加荷载和减小沥青面层厚度均会增加沥青路面结构响应、降低使用寿命,但是二者的影响机理不同;粒料应力硬化特性能在一定程度上缓解高应力水平下的沥青层底受拉.
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.
关键词
道路工程/沥青路面/有限元/粒料材料/动态回弹模量/路面结构力学行为/非线性Key words
road engineering/asphalt pavement/finite element/granular material/resilient mod-ulus/pavement structure mechanical behavior/non-linear引用本文复制引用
基金项目
国家自然科学基金(52008044)
国家自然科学基金(52278437)
湖南省教育厅自然科学研究项目(21B0296)
湖南省交通厅科技进步与创新项目(202236)
长沙理工大学道路灾变防治及交通安全教育部工程研究中心开放基金(kfj210401)
出版年
2024
NETL
NSTL
维普
万方数据