摘要
沥青路面的动力响应是基于力学的沥青路面设计方法中的主要控制指标,其变化规律也是路面结构性能的评价依据。文中通过在试验路中埋设沥青应变计,采集在移动车辆荷载作用下的动力响应,对乳化沥青冷再生作基层的沥青路面进行了动力响应分析。分析结果表明：（1）对于双联轴车辆,两后轴经过时应变波形会产生相互干涉、叠加。（2）沥青面层底应变随速度增大而降低,随轴重增加而增大。乳化沥青冷再生基层底应变值较小,随速度提高而降低的趋势较缓。（3）乳化沥青冷再生基层底应变均小于沥青面层底应变。这与完全连续状态的弹性层状理论计算结果矛盾,说明两者之间并非完全连续状态。（4）作为底基层的原路面基层的修复状态对乳化沥青冷再生基层底的动力响应有显著影响,使其压应变显著增大,对沥青面层底动力响应影响不显著。
Dynamic response of asphalt pavement is the major controlling index in the design method based on the mechanics,and its change rule is also the evaluation basis of the pavement performances.By burying asphalt strain gauge in the test road and gathering the dynamic response of the pavement under moving vehicle load,in this paper the dynamic response of the asphalt pavement with emulsified asphalt cold recycled base course is analyzed.The analysis results indicate that：1）for the twin shaft vehicle,the strain curves caused by two rear shafts will stack,and interfere with each other;2）bottom strain of asphalt layer decreases with the increase of speed,and increases with the axial load increasing.The strains of emulsified asphalt cold recycled base course bottom is smaller than asphalt layers,and the trend of reduction is slower than asphalt layers with increase of speed;3）strains of emulsified asphalt cold recycled base course bottom are smaller than the asphalt layers bottom.This is opposite to the calculation result using the elastic layered theory with the completely continuous state which means that it is not completely continuous between the two layers.4）The repair status of the sub-base using the original pavement base course has significant impact on the strains of emulsified asphalt cold recycling base course bottom and causes the compression strain increase,but has no obvious impact on dynamic response of the bottom of asphalt surface course.
出处
《公路》
北大核心
2018年第3期36-41,共6页
Highway
基金
交通运输部应用基础研究项目,项目编号2013319781140
安徽省交通建设科技项目,项目编号AHJK2015-01
关键词
道路工程
乳化沥青冷再生
动力响应
沥青应变计
road engineering
emulsified asphalt cold recycling
dynamic response
asphalt strain gauge
