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自行研制了足尺路面加速加载试验设备,介绍了控制系统的硬件组成并进行了路面实验。控制系统采用CAN总线技术,通过变频器矢量控制方法实现路面加速加载设备的单方向循环式加载,利用该设备能够短时间内产生车辙和疲劳破坏,为道路设计、生命周期内的破坏机理研究、施工及验收以及新技术,新材料的应用提供了可靠的实验数据。通过路面加速加载实验,研究车辆荷载、行驶速度和轮胎胎压对路面结构的应变关系。结果表明:在行车荷载作用下,沥青面层底部动应变响应呈拉压应变交变状态;当胎压、荷载和速度发生变化时,沥青面层底部拉应变较压应变变化大,但随着速度的提高,变化趋势逐渐变小。
Developed a full-scale pavement acceleration loading test equipment, introduced the control system hardware components and carried out the pavement experiment. The control system uses the CAN bus technology to realize the unidirectional cyclic loading of the road acceleration loading equipment by the vector control method of the frequency converter. The use of the equipment can generate the rutting and fatigue damage in a short time, which is a research on the road design and the failure mechanism in the life cycle, Construction and acceptance as well as the application of new technologies and new materials provide reliable experimental data. Through the accelerated loading test on pavement, the relationship between vehicle load, traveling speed and tire pressure on the pavement structure was studied. The results show that under the action of driving load, the dynamic strain response at the bottom of asphalt surface is in the state of tension-compression strain change. When the tire pressure, load and velocity change, the tensile strain at the bottom of asphalt layer changes greatly, The speed of change, the trend of change becomes smaller.