路面实体结构模型力学响应试验方法研究

发布时间：2018-08-28 09:28

【摘要】：为获得荷载作用下路面结构的实际力学响应规律,设计并完成了路面实体结构模型试验,讨论了试验方法的平行性和复现性,分析了3种典型路面结构模型的力学响应规律。结果发现:路面结构模型力学响应试验方法平行性、复现性、可靠性较好,可作为路面结构力学响应行为研究的一种有效手段;当试验条件相同时,不同路面材料的结构模型受力情况存在显著差别,水泥稳定碎石和沥青混凝土表面径向应变随着与荷载距离的增加呈现压缩-拉伸交替变化、具有明显的力学响应特征点,而水泥混凝土并无此现象;近荷载端沥青路面结构处于受压区,而稍远离荷载的位置则为受拉区,当荷载较重时,可能会引起沥青路面表面开裂,形成荷载型Top-down裂缝;路面结构模型力学响应试验可以反映路面材料在结构中的实际工作状态,能够为路面结构计算和材料参数确定提供参考。
[Abstract]:In order to obtain the actual mechanical response law of pavement structure under load, the model test of pavement solid structure is designed and completed. The parallelism and reproducibility of test methods are discussed, and the mechanical response laws of three typical pavement structure models are analyzed. The results show that the test methods of mechanical response of pavement structure model are parallel, reproducible and reliable, which can be used as an effective means to study the mechanical response behavior of pavement structure, and when the test conditions are the same, There are significant differences between the structural models of different pavement materials. The radial strain on the surface of cement stabilized macadam and asphalt concrete varies alternately with the increase of load distance, and has obvious mechanical response characteristic points. But the cement concrete does not have this phenomenon; the asphalt pavement structure near the load end is in the compression area, but the position far away from the load is the tensile zone, when the load is heavy, it may cause the asphalt pavement surface to crack and form the load type Top-down crack. The mechanical response test of pavement structure model can reflect the actual working state of pavement material in the structure and can provide a reference for the calculation of pavement structure and the determination of material parameters.
【作者单位】：哈尔滨工业大学交通科学与工程学院;交通运输部公路科学研究院;中交公路规划设计院有限公司;
【基金】：国家自然科学基金项目(50878100) 中央级公益性科研所基本科研业务费专项资金项目(2015-9027) 交通运输部应用基础研究项目(2013319223010)
【分类号】：U416.2

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