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

发布时间：2019-04-13 15:14

【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。
[Abstract]:In order to study the difference of (JPCP) response law of cement concrete pavement with common joints under the action of temperature load when the base type changes, three kinds of common base were paved, respectively, the AC functional layer was added to the cement stabilized macadam base course (CTB). The poor concrete base (LCB), graded macadam base (GCSB), was paved with a full-scale test road of cement concrete with force transfer rod and pull rod on it. The temperature and strain fluctuation at different positions and depths in the plate were monitored by vibrating string strain gauge. Furthermore, the finite element calculation model of temperature stress of cement concrete pavement based on multi-layer slab system on Winkler foundation is established (the modulus of each structure layer is determined by loading plate test). The reliability of the model is verified by the measured strain and the stress data. The boundary conditions of the model for calculating the temperature stress are determined. On the basis of this, the finite element model of thermal stress of nine-link plate is established, and the responses of different base types, surface-base interface treatment mode, joint width and positive and negative temperature difference to the pavement panel are analyzed. The results show that the variation law of strain / stress-temperature in the slab has a very obvious approximate hysteretic characteristic, the temperature stress in the slab of lean concrete base is the largest, and that of graded macadam base is the smallest. The temperature warping stress calculated by this method is between the results of the other three representative methods.
【作者单位】：交通运输部公路科学研究院;
【基金】：交通运输部西部交通建设科技项目(2007 318 223 01-4)
【分类号】：U416.216

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