Research On Road Structure Information Monitoring Method Based On FBG Sensor

Currently, our country is undergoing highway network construction and a large number of completedhighway maintenance period，infrastructure investment is very large, how to realize real-time monitoring state ofthe road and extend the service life of road is a key technology. Traditional road surface testing technology can’tachieve real-time monitoring of road condition, now embedded high frequency FBG (Fiber Bragg Grating)sensors into each structural layer of the road, it can realize the real-time monitoring of the road. In highwayconstruction and maintenance use highway structure information monitoring system not only can improve thepertinence and efficiency of road maintenance, also can improve the road service quality, extend the service lifeof road, so as to obtain great social benefits and economic benefits.Based on full research of the existing road structure testing technology, this paper aimed at theshortcomings of the existing methods proposed use FBG sensor in highway structure information monitoringsystem. The deformation coordination of FBG sensor and asphalt mixture was studied, proposed the correctionequation of compression mode and the correction equation of tension mode; according to the materialcharacteristics of each structural layer and construction method of the testing road, designed the scheme toembed the FBG sensor, and embedded the FBG sensor successful.The structure information monitoring system of this research use, SQL Server database to realize the dataprocessing, through the GPRS wireless transmission, data can be transmitted to the server which has a fixed IPaddress, administrators can log in system at any time to check the road condition information.The research showed that: the deformation between FBG sensor and asphalt mixture had linear relation, souse FBG sensor for highway structure information monitoring is feasible; applied tension on different substratematerial, with the increase of load, the speed of continuous porous medium strain value increase is faster thancontinuous medium；through indoor rutting test, because of the pull-compressive strain appear alternately, iteasily lead to structure fatigue cracking; applied different static coaxial load, the data showed that overload willcause serious impact on road structure; the vehicle which is standard axial load was carried out at differentspeed，the data showed that the higher speed of the vehicle, the smaller effects on the road, and the rear wheelscause bigger impact on the road than the front wheels.