不同基层类型水泥混凝土路面温度翘曲结构试验与理论分析  

Structural Experiment and Theoretical Analysis of Thermal Curling in JPCP with Different Base Types

作　　者：田波[1] 权磊[1] 牛开民[1] 

机构地区：[1]交通运输部公路科学研究院,北京100088

出　　处：《中国公路学报》2014年第6期17-26,共10页China Journal of Highway and Transport

基　　金：交通运输部西部交通建设科技项目(2007 318 223 01-4)

摘　　要：为了研究基层类型变化时普通接缝水泥混凝土路面(JPCP)在温度荷载作用下的响应规律差异,铺筑了3种常用基层,分别为水泥稳定碎石基层(CTB)加铺AC功能层、贫混凝土基层(LCB)、级配碎石基层(GCSB),并且在其上铺筑了设置有传力杆、拉杆的水泥混凝土足尺试验路,通过振弦式应变计监测了板内不同位置与深度处的温度与应变波动情况;进一步建立了基于Winkler地基上多层板体系的水泥混凝土路面温度应力有限元计算模型(各结构层模量通过承载板试验确定),通过实测应变、应力数据验证了模型的可靠性,确定了计算温度应力的模型边界条件。在此基础上,建立了九联板温度应力有限元模型,分析了采用不同基层类型、面层-基层界面处理方式、接缝宽度以及正负温差对路面板的响应。结果表明:板内应变/应力-温度变化规律具有非常明显的近似滞回特性,贫混凝土基层路面板内温度应力最大,级配碎石基层的最小;按该方法计算的温度翘曲应力处于其他3种代表性方法计算结果之间。In order to investigate the differences of response to thermal load in jointed plain concrete pavement （JPCP） resulted by the change of base types, the full-scale instrumented concrete pavements using three typical base combinations, AC over CTB, LCB and GCSB respectively, with dowel bars and tie bars in the slab were constructed and the temperature and strain variations were monitored via the vibrating wire embedment strain gauges in different depths. Additionally, based on the multi-layer system laying over Winkler foundation, an FEA model was developed to calculate the thermal stress （the material properties were determined by the plate bearing test）. The model was validated by the measured strain and stress data, and the boundary conditions of the model were also determined. Furthermore, the nine-slab FEA model was established and the responses were analyzed when adopting four real typical structures, including two different slab-base interface treatment methods, two joint cutting width and positive and negative temperature profiles. The results show that the variations of strain/stress vs. temperature has a hysteretic-like characteristic and the thermal stress is maximum in the slab with LCB and minimum in the slab with GCSB. The calculated thermal curling stresses adopting the proposed approach are in the range of the calculated results of the other three methods.

关 键 词：道路工程 水泥混凝土路面 结构试验 温度翘曲应力 数值模拟 基层类型 

分 类 号：U414.216[交通运输工程—道路与铁道工程]