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移动荷载作用下饱和沥青路面动力响应三维有限元分析

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Keywords: 道路工程,沥青路面,多孔介质理论,有限元,移动荷载

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Abstract:

沥青路面结构在外界环境作用下是气、液、固三相介质体,水和荷载的耦合作用导致了沥青路面初期损坏的产生,探究其在车辆移动荷载作用下的动力响应是获知沥青路面结构行为的前提。首先,在沥青路面饱和情况下,作一级合理近似,将其视为流固两相介质。基于多孔介质理论,对于典型半刚性基层沥青路面结构建立了移动荷载作用下的三维有限元模型;而后对比分析了移动荷载作用下,饱和沥青路面和无水沥青路面三向应力、应变响应的时程变化规律以及竖向应力场的三维分布情况。结果表明移动荷载作用下,饱和沥青路面面层内的动力响应特性与其无水状态时不同;沥青路面在饱和状态下更易产生疲劳开裂、永久变形等结构性损坏;路面设计指标中采用弯拉应变更为合理。

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