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基于车辆加载试验的沥青路面动力响应分析

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Keywords: 道路工程,动力响应,试验研究,沥青路面,疲劳寿命

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Abstract:

为获得行车荷载作用下沥青路面的实际动力响应规律,以实体工程为依托,铺筑了3种典型沥青路面结构的试验路.通过车辆加载试验,分析了车辆轴型、轴重、车速和胎压对路面结构层层底应变响应的影响规律,并通过疲劳寿命预估模型探讨了沥青路面基于动力响应的疲劳寿命.研究表明路面结构在面层底和基层底主要呈现出拉应变状态,应变响应过程体现出黏弹性特征;路面面层底部的横向应变小于纵向应变,应变响应随车速的提高逐渐减小,而随轴重的增加显著增大;车轮胎压对路面动态应变响应有显著的影响作用,在车胎超压和轴重超载的叠加效应下,路面将处于极为不利的受力状态;车辆超载行驶是影响路面疲劳寿命的重要原因,应予以严格控制.

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