超薄白色罩面(UTW)结构设计方法  

Design method for ultra-thin whitetopping (UTW) structures

作　　者：李宇峙[1] 崔鹏[2] 邵腊庚[1] 

机构地区：[1]长沙理工大学,湖南长沙410076 [2]同济大学,上海200092

出　　处：《土木工程学报》2006年第9期123-127,共5页China Civil Engineering Journal

摘　　要：为了研究半刚性基层沥青路面上超薄白色罩面(UTW)结构设计方法,采用三维有限元方法计算了UTW路面结构的荷载应力。通过计算确定了UTW路面的设计荷位为纵缝边缘中部。基于基层顶面当量回弹模量(Et)和旧沥青层模量(Ea)及统计分析结果,提出结构强度综合系数为Rj=E(t1/3)×log(Ea),得到了Rj<17时的板厚设计图表,并验证了Rj<17适用于我国大部分需要修复的沥青路面的路况。借鉴水泥混凝土路面设计规范,在考虑疲劳及可靠度的基础上,提出了考虑温度和荷载综合影响的UTW路面结构设计计算公式,并通过足尺试验验证了该设计方法的可行性,同时对确保UTW层间黏结的施工方法进行了探讨。最后探讨了UTW路面结构的适应性,并指出其在重载高等级道路的适用性尚需实体工程进一步验证。In order to investigate the design method for UTW structures on semi-rigid asphalt pavement, a 3-D FE code is employed to calculate the load-induced stresses of a UTW structure. The calculation confirms that the center of the longitudinal joint edge is the design loading position of UTW. Based on an Equivalent Resident Modulus of the top of the base （Et）, modulus of existing asphalt layer （Ea） and statistic analysis result, a generalized coefficient of structural strength （Rj） is proposed as, Rj=Et^（1/3）×log（Ea）, together with a thickness design chart for Rj〈17. It is also validated that the Rj value, if less than 17, is applicable to most asphalt pavements in China that require rehabilitation work. Considering the fatigue and the reliability referencing in the equations of the current cement concrete pavement design specifications, the combined effect of temperature and load on UTW structure for pavement design is calculated and the corresponding design method is validated by a full-scale test. Moreover, the construction method is discussed in the paper to ensure a good interface condition of UTW, and the adaptability of UTW structure is also analyzed. It is pointed out that the adaptability of UTW to heavy-load expressways should be further studied via projects in the field.

关 键 词：道路工程 超薄白色罩面 结构强度综合系数 设计方法 

分 类 号：U416.224[交通运输工程—道路与铁道工程]