基于五维光纤传感器的沥青路面动水压力测量的研究

基于国内外已有的研究成果，介绍了一种自行研发的五维光纤传感器，用于测量沥青路面结构内的动水压力. 该传感器应用光纤传感原理，采用十字梁结构将4个光纤传感器固定，并填充水泥混凝土以稳定及保护传感器. 将五维传感器埋设于路面，并使之处于饱水状态. 当加载车辆以不同速度驶过时，光纤光栅将传递压应变信号，然后由调制解调器接收信号，即可测量出动水压力值. 实测结果发现，动水压力呈正负压交替现象，且最大正压力可达到0.115 MPa，最大负压力达到0.073 MPa. 各方向的动水压力均不相同，但均随车速递增. 关键词:沥

Measurement of Dynamic Water Pressure of Asphalt Pavement by Five-Dimensional Optical Fiber Sensor

Based on domestic and foreign studies, a method used for measuring the dynamic water pressure of asphalt pavement by five-dimensional optical fiber sensor was proposed. According to the sensing principl, a five dimensional fiber optic sensor was prepared by fixing four optical fiber sensors on a crossbeam. In addition, the concrete cement was used to stabilize and protect the sensor. Test of dynamic water pressure was conducted by embedding the sensor in the asphalt pavement, which was kept in water-saturated state. When the vehicles passed the test section at different speeds, the signals of compressive strain could be transferred to the modulator demodulator by the fiber grating. Therefore, the dynamic water pressure in different directions could be collected during the whole process. It can be concluded that dynamic water pressure presents a continuing exchanging process of positive and negative pressure. The maximum positive pressure is about 0.115 MPa and the maximum negative pressure is about 0.073 MPa. The dynamic water pressure in all directions varies much, but it all increase with the increase of the vehicle speed.