基于传感器的组合式柔性基层路面结构动力响应监测分析

Monitoring and Analysis of the Dynamic Response of the Combined Flexible Base Pavement Structure Based on Sensors

摘要: 为探究组合式柔性基层路面结构的动力响应，评价路面结构在真实汽车荷载下的受力状态，本研究针对组合式柔性基层沥青路面开展试验段测试与分析。通过在各结构层底埋设三向应变传感器，并设定不通车速、车辆载重方案对试验路段进行重复加载，对各项应变数据进行采集与分析。结果表明：车速对各结构层动态响应影响显著，随车速增加，各层应变减小，应变响应时间变短；横向应变和竖向应变的极大值在AC-20C层底，拉应变最大值在水泥稳定基层底部，级配碎石层应变响应幅度小，应力消散作用良好。车辆轴重对结构层响应有明显影响，轴重增加会导致应变响应极值增大。因此车速、深度、轴重对路面结构力学响应影响显著，研究成果可为组合式柔性基层结构路面设计及超载控制提供参考，有利于保障沥青路面安全服役和健康水平。

Abstract: In order to explore the dynamic response of the combined flexible base pavement structure and evaluate the stress state of the pavement structure under the real vehicle load, this study carried out the test section test and analysis for the combined flexible base asphalt pavement. By embedding three—dimensional strain sensors at the bottom of each structural layer and setting different vehicle speeds and vehicle load schemes to repeatedly load the test section, the strain data were collected and analyzed. The results show that the vehicle speed has a significant impact on the dynamic response of each structural layer. With the increase of the vehicle speed, the strain of each layer decreases and the strain response time becomes shorter; the maximum values of the transverse strain and the vertical strain are at the bottom of the AC-20C layer, the maximum tensile strain is at the bottom of the cement stabilized base, and the strain response amplitude of the graded crushed stone layer is small, with a good stress dissipation effect. The vehicle axle load has an obvious impact on the response of the structural layer, and the increase of the axle load will lead to the increase of the extreme value of the strain response. Therefore, the vehicle speed, depth and axle load have a significant impact on the mechanical response of the pavement structure. The research results can provide a reference for the design of the combined flexible base structure pavement and the overload control, which is conducive to ensuring the safe service and health level of the asphalt pavement.