摘要
改革开放以来,我国公路交通事业取得了令人瞩目的巨大成就.截至2019年底,我国公路通车总里程为500多万千米,居世界第二位,高速公路总里程达14万多千米,居世界第一位,有力地支撑了中国的经济发展.但是,我国公路基础设施的人均占有量仅为美国的1/4左右,预计在2035年以前,我国还将新建普通公路1×10~6 km、高速公路5×10~4km以上.可见,我国高速公路建设任务依然繁重.
The development of long-life pavement is the most effective means to reduce the resource consumption of road construction and maintenance.It can also relieve the traffic congestion which is caused by large and medium scale maintenance of pavement,and improve the road capacity and road network transportation efficiency.In this paper,the basic characteristics of long-life pavement were illustrated,and the current technology system of long-life pavement was introduced.The key technical problems and main scientific problems of the long-life pavement structure design,the design and development of durable pavement materials,and the pavement maintenance management and large and medium scale maintenance were analyzed.The results indicated that the pavement structure is a large scale spatial three-dimensional structure although it is simple in geometry.It is necessary to select three-dimensional elastic mechanics theory or even more complicated mechanical theory to analyze its mechanical response.The pavement materials exhibit the viscoelastic plastic characteristics,because most of the pavement materials use asphalt as binder.Therefore,only the visco-elasticplastic mechanics theory can accurately describe the mechanical behavior of the pavement.Moreover,under the multiphysics coupling effects of temperature,humidity,ultraviolet rays and ice,snow,water,steam,the scientific problems inherent in the pavement structure are very complex.The material used for pavement is a kind of mixture with multi-phase,multi-scale,multi-component features.The micro-structure characteristics inside material,the micro-mechanism of load and load transfer,the damage evolution occurred and developed inside material,along with the corresponding relationship between them and the structural macro-performance parameters are extremely complicated.The performance characteristics of pavement material should be scientifically described as the guidance for the scientific design of the pavement material and the scientific analysis of the pavement structur
作者
郑健龙
吕松涛
刘超超
Jianlong Zheng;Songtao Lü;Chaochao Liu(School of Traffic and Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China;National Engineering Laboratory of Highway Maintenance Technology,Changsha University of Science&Technology,Changsha 410114,China)
出处
《科学通报》
EI
CAS
CSCD
北大核心
2020年第30期3219-3227,共9页
Chinese Science Bulletin
基金
国家自然科学基金(51578081)资助
