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基于疲劳损伤的沥青路面设计温度及预估模型研究

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Keywords: 道路工程,永久性沥青路面,相关性分析,设计温度,拉应变,疲劳损伤

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Abstract:

针对沥青路面结构必须控制的疲劳破坏形式,以沥青层层底拉应变作为控制沥青路面疲劳开裂的指标。通过实测沥青面层层底最大拉应变与路面结构不同深度处路面温度的相关性分析,确定了沥青路面疲劳损伤的设计温度,提出了以沥青层中间温度作为沥青路面疲劳开裂分析的设计温度和试验条件。通过实测永久性沥青路面试验路每小时的路面温度和气象数据,分析了沥青层中间温度的分布规律,对沥青层中间温度与气温、路面深度之间的相关关系进行了计算分析,建立了沥青层中间温度的预估模型。结果表明,沥青路面应变响应与温度密切相关,随着路面温度的升高,沥青层底拉应变增大;沥青层中间深度处温度与沥青层底拉应变相关性最高,采用沥青层中间深度处温度能较好地评价路面结构的抗疲劳性能。

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