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为深入研究实际交通荷载下长大纵坡路段路面结构的动态力学行为,开发了三维动应变传感器。选择青岛—兰州高速公路陕西段工程段作为试验路,施工中在5个断面的沥青面层底部布置了开发的传感器,采用典型重型运输车辆作为加载装置,检测不同坡道位置沥青路面的动力响应,分析了坡道位置和轴重对路面动力响应的影响。研究结果表明:随着坡长的增加和轴重的增大,面层底部的垂向、横向和纵向动应变增加;面层底部垂向压应变受坡长和轴重的影响严重,而面层底部纵向和横向应变主要受坡长影响;目前国际上提出的长寿命路面设计控制指标,不适合于半刚性基层路面结构。
In order to further study the dynamic behavior of pavement structure of long and long sections under actual traffic load, a three-dimensional dynamic strain sensor was developed. The engineering section of Qingdao-Lanzhou Expressway Shaanxi section was selected as the test road. The developed sensors were arranged on the bottom of 5 sections of asphalt pavement in construction. The typical heavy-duty transport vehicles were used as the loading device to test the dynamic response of asphalt pavement at different slope positions The influence of the location of the ramp and axle load on the dynamic response of pavement was analyzed. The results show that with the increase of slope length and axial load, the vertical, lateral and longitudinal dynamic strain at the bottom of the surfacing layer increases. The vertical compressive strain at the bottom of the surfacing layer is seriously affected by the slope length and axle load. Longitudinal and transverse strata at the bottom of the bed are mainly affected by the length of the slope. At present, the control indexes of the long-life pavement design proposed in the world are not suitable for the semi-rigid base pavement structure.