Research Of Intelligent Detection Technology Applied In Loess Subgrade

Not only design and construction,maintenance and security will affect expressway.Especially,landslide and settlement in loess area will cause a huge investment.Otherwise,there will be some key indicators which express the secret,sudden,and needing a long term cumulative change,only daily inspection is difficult to detection and prevention,thereby,this dissertation which is related on the long-term monitoring of subgrade and slope in loess area will be meaningfull.In this dissertation,based on fiber-optic and optical fiber communication technology,it can realize that monitors the stability and deflection of subgrade and slope,therefore,it can build a system which can monitor subgrade and slope in a long term,and then,monitoring data will benefit the maintenance and reconstruction.This dissertation reviews existing related researches in stability of loess slide and monitoring system filed.Moreover,some deterioration,mechanism analysis and related control measures were also introduced.In order to analyze long-term performance of loess subgrade,this research built an intelligent monitoring system based on loess subgrade of Ji-He expressway and buried optical fiber.This system can express soil pressure,settlement and deflection of loess subgrade in different area during construction and operation stage.In order to figure out life-cycle deflection of cut slope and actual stress state of related supporting structures,this research built a system which can monitor the surface deflection of loess side slope in selected Ji-He expressway testing sections.This system can present the state of motion and deflection tendency during construction and acting by environmental factors.Through selecting special testing section in Ji-He expressway,this research monitors the deflection and stress state of anti-slide piles based on vibration sensor and distributed fiber sensor.Through monitoring the location of sliding surface,it can validate the accuracy of exploration data,and master the slope stability during construction and acting by environmental factors.Thereby,it can adjust construction scheme in time,and support for decision and administration departments in operation.