水泥混凝土路面板早龄期翘曲行为数值分析研究

NUMERICAL ANALYSIS OF EARLY-AGE CURLING BEHAVIOR OF CEMENT CONCRETE PAVEMENT

以1/4面板结构模型程序为基础,考虑基层与面板的摩擦界面作用,开展了足尺路面板结构的三维早龄期翘曲有限元数值模拟研究,并与现场实验进行校验。对比显示,相比1/4面板模型,考虑基层摩擦接触界面的全面板模型程序板角位移计算值减小,日变化量级、趋势与试验监测结果更为接近,面板-基层界面参数对计算迭代收敛性影响较大。不同的工况组合下,由于早龄期的历程效应路面板会产生很多复杂的行为特征,计算仿真显示面板早龄期存在板角-1/4板中-板中的翘曲变形迁移运动,不同条件的边界约束导致演化形成不对称面板翘曲。在夏季28 d的记忆-松弛-记忆多次叠加历程作用下,路面板一般将产生正的固化温度差性状。由于混凝土早龄期行为的复杂性,早龄期数值模拟技术仍需研究模型优化、材料早龄期参数特性以及施工工艺的影响。

Based on 1/4 slab simulation program, considering the interface friction between the slab and base, a simulation program for 3D early-age curling of full-scale slab was developed and validated by field experiments. Compared with the 1/4 slab program, full-scale slab programs which consider the interface friction may reduce displacement at the corner of the slab, and the magnitude of daily variation and slab displacement calculated by full-scale slab program are more identical to experimental results. Additionally, the calculation iterative convergence is greatly influenced by parameters of the interface between slab and base. Due to process effect in early age slabs, lots of complex responses are evidenced in slabs under different case combinations. Simulation results show that early-age slabs display curling movement from the corner to 1/4 of the distance away from the center of slab. Asymmetric curling in the slab is caused by different boundary constraints. Under superimposed and repeated effects （remember-relax-remember） over 28 days in summer, a positive built-in temperature difference exists in slabs generally. Owing to the complexity of concrete early-age behavior, further research in model optimization, characteristics of early-age material parameters, and the effect of construction technology on numerical simulation of early-age slabs are suggested.