摘要
为揭示温度、湿度和动载耦合作用下沥青路面的损坏机理,本文在考虑初始静应力场的条件下,构建了水-热-力全耦合三维有限元沥青路面结构模型,研究了温度场对动应力、动应变以及超孔隙水压力的作用规律。结果表明,在路表,随着路面温度升高,横向和纵向动态拉伸应变增大,且动应变的波形变化更为复杂,容易导致路面出现横向和纵向裂缝。沿路面深度方向,水-热-力耦合作用下动应变分量负峰值以及超孔隙水压力均呈指数函数分布。随着路面温度的升高,动应变分量负峰值随温度的变化可近似采用指数函数描述,当路面温度超过30℃时,动应变分量快速增长;超孔隙水压力负峰绝对值随着路面温度的升高呈线性增大,其中在路表的增长速率最快。研究结果将为揭示多场耦合作用下沥青路面的损坏机理以及沥青路面结构的设计提供参考依据。
To reveal the damage mechanism of asphalt pavement under the coupled effects of temperature,humidity,and dynamic load,fully coupled thermohydromechanical threedimensional finite element models were constructed for the asphalt pavement structure,with consideration of the initial static stress field.The effects of temperature field on dynamic stresses,dynamic strains,and excess pore water pressure were investigated.The research results indicate that at the road surface,as the pavement temperature increases,the horizontal and longitudinal dynamic tensile strains increase,and the waveform changes of dynamic strains become more complex,which can easily lead to the formation of horizontal and longitudinal cracks in the pavement.Along the depth direction of the pavement,under the hydrothermomechanical coupling,the negative peak values of dynamic strain components and excess pore water pressure follow an exponential distribution.With the increase of pavement temperature,the negative peak values of dynamic strain components can be approximately described by an exponential function.When the pavement temperature exceeds 30℃,the dynamic strain components grow rapidly.The absolute value of the negative peak of excess pore water pressure increases linearly with the increase in pavement temperature,with the fastest growth rate at the road surface.The research results will provide a reference for revealing the damage mechanism of asphalt pavement under multifield coupling effects and for the design of asphalt pavement structures.
作者
董鹏军
曹雪娟
唐伯明
DONG Pengjun;CAO Xuejuan;TANG Boming(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;School of Materials Science and Engineering,Chongqing Jiaotong University,Chongqing 400074,China)
出处
《东南大学学报(自然科学版)》
北大核心
2025年第4期1100-1112,共13页
Journal of Southeast University:Natural Science Edition
基金
国家自然科学基金资助项目(51978115,52278441)。
关键词
道路工程
沥青路面
多场耦合
动力响应
数值模拟
road engineering
asphalt pavement
multi-field coupling
dynamic response
numerical simulation
作者简介
董鹏军(1997-),男,博士生;通信作者:曹雪娟,女,博士,教授,博士生导师,caoxj@cqjtu.edu.cn.
