Research On Application Of FBG In Highway Soft Foundation Monitoring System With C#

Soil is widely distributed along the river, lake and coastal in our country and these areas are typically economically developed areas that urgently need to build the highway. The different characteristics in different layer, in different local, unpredictable and other characteristics causes various degrees damage,serious or even life-threatening property to highway construction and operation. At the same time, the traditional monitoring methods with low accuracy by the construction disturbance and climate and other factors, can not achieve real-time monitoring of limitations, therefore, the research on application of fiber optic sensors to real-time monitoring in freeway not only has the academic value, but also has a great economic and social benefits.Through literature investigation, the paper summarizes the development process of the fiber optic sensor, principle, advantages and application status at home and abroad, proposes the application of fiber optic sensors to monitor the importance of real-time during construction, operation routine monitoring of the problems systematically of the highway soil foundation.Based on FBG sensing technology, the health monitor hardware system of the soil foundation of the highway is established.Based on Socket and ADO control on Visual Basic and Microsoft Access platform, a data acquisition scheme is presented and the structural health monitoring software system of the highway soil foundation is established, enabling a large number of sensors'data acquisition and displaying of real time data and curve as well as data saving and retrieving in database. Data acquired by the software are in terms of temperature and strain instead of wavelength, avoiding the limitations of the software offered by interrogation.Temperature, strain and pore pressure are monitored during the construction period of the highway soil foundation. The result show the construction is in a normal state, at the same time, compared to conventional monitoring methods, it has been validated in soft fiber sensor-based monitoring is feasible.