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《Journal of South China University of Technology(Natural Science Edition)》 2016-06
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Mechanical Behavior Characteristics of Asphalt Plug Expansion Joint Pavement's Interface

XIAO Min-min;Key Laboratory of Road and Traffic Engineering of the Ministry of Education,Tongji University;Shanghai Institute of Technology;  
In APEJ( Asphalt Plug Expansion Joint) pavement,the interface is the weakest link in the whole structure. In this paper,the material parameters of each part of the expansion joint were determined,and,by selecting the maximum axle load( 140 k N) of road-grade I as the calculating load,a finite element model of the pavement was established with ANSYS. Then,the interfacial indexes were calculated under 4 kinds of loads,and the corresponding interfacial controlling indexes were extracted. Finally,the effects of expansion joint mixture's modulus,interfacial friction coefficient,interfacial elevation difference,horizontal force and tire contact pressure on the interfacial controlling indexes were analyzed. The results show that( 1) the interfacial controlling indexes include the tensile stress,the shear stress and the interfacial vertical displacement;( 2) both the horizontal force and the tire contact pressure have a great influence on the interfacial tensile stress and shear stress,while the modulus ratio,the horizontal force,the tire contact pressure exert a great influence on the vertical displacement of the interface;( 3) such measures as choosing expansion joint mixture with great modulus,coarsing the interface,setting small interfacial elevation difference,preventing urgent starting or braking on the expansion pavement and avoiding overload are all effective in preventing the interface from damage.
【Fund】: 上海自然科学基金资助项目(13ZR1441100)~~
【CateGory Index】: U416.217
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