沥青填入式伸缩缝铺装中，界面是整个伸缩缝结构的最薄弱环节． 鉴于此，文中选取公路-Ⅰ级荷载的最大轴重140kN 作为计算荷载，在确定伸缩缝各组成部分材料参数的基础上，建立了沥青填入式伸缩缝铺装 ANSYS 有限元模型． 通过计算 4 种不同荷位下的界面指标，并提取界面控制指标，进而分析伸缩缝材料模量、界面摩擦系数、界面高度差、水平力、轮胎接触压力等对界面控制指标的影响． 结果表明:界面控制指标为界面拉应力、界面剪应力、界面竖向位移;水平力、轮胎接触压力对界面拉应力及界面剪应力的影响较大，模量比、水平力、轮胎接触压力对界面竖向位移的影响较大;选择模量较大的伸缩缝混合料、界面进行粗糙化处理、采用较小的界面高度差、防止车辆在伸缩缝上紧急启动或刹车、防止车辆超载等措施有利于缓解界面损害．

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 se- lecting the maximum axle load (140 kN) 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 mo- dulus 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，set- ting 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.