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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。
In order to obtain the actual mechanical response of pavement structure under load, the physical model test of the pavement was designed and completed. The parallelism and recurrence of the test method were discussed. The mechanical response of the three typical pavement structure models was analyzed. The results show that pavement structure model can be used as an effective method to study the mechanical response of pavement structure because of its parallelism, reproducibility and reliability. When the test conditions are the same, the structural models of different pavement materials are stressed There is a significant difference between the two cases. The radial strain on the surface of cement stabilized macadam and asphalt concrete shows alternating compressive-tensile changes with the increase of load distance, and has obvious mechanical response characteristic points, while cement concrete does not have this phenomenon. The asphalt pavement structure is in the compression zone, while the slightly away from the load position is the tension zone. When the load is heavy, the asphalt pavement surface may be cracked to form a load-type Top-down crack. The pavement structure model mechanical response test can reflect The actual working status of pavement materials in the structure can provide reference for pavement structure calculation and material parameter determination.