基于光纤光栅技术的沥青路面结构应变场分析

在北京某高速公路埋设了光纤光栅传感器以开展应变研究,两组三维传感器组分别被布设于沥青路面的中、下面层以获取各层位内的三维应变信息。通过改变车辆的加载重量和运行速度,分别监测应变响应的变化趋势和规律。试验选用的接地压力范围由0.49~0.97 MPa,而车辆的运行速度包括17、30、44、56、69 km/h等。基于采集数据的计算和分析表明,不同层位的各传感器应变值均随车速降低和轴载增加而显著增加,该规律与力学分析及经验预测的结果一致,这不但验证了将光纤光栅传感器进行路用的可行性,并且提升了传感器现场埋设的流程和工艺。试验结果说明了光纤光栅传感器具有良好的路用性质,将其应用于沥青路面结构的应变场测试是可行的。

Research on Strain Field of Asphalt Pavement Based on FBG Sensor Technique

The FBG sensors were embedded in a Beijing freeway,and two 3D-sensor groups were placed in middle and bottom layers of bituminous concrete pavement to capture 3D strain information.The experiment was conducted to test the internal response values of strain under different vehicle weights and loading speeds.The actual tyre ground pressures varied from 0.49 MPa to 0.97 MPa,and the driving speeds included 17 km/h,30 km/h,44 km/h,56 km/h and 69 km/h.After calculating and analyzing those monitoring data,it was found that all the strain values of sensors rise largely with the decrease of speed and the increase of weight.These trends are consistent with mechanical analysis and experiential prediction,which ulteriorly testify the feasibility of the FBG sensor technique and sensor embedding craft.The experiment result shows that FBG sensors have stable characteristic and could be widely used for monitoring the structure strain of asphalt pavement.