Forward-back Analysis Of Pavement Structure Geological Radar Based On GPRMAX

With the development of road engineering in China,the requirements for highway inspection are getting higher and higher.In order to meet the development of the times,an efficient and fast detection method is needed.As an efficient detection method,the geological radar can continuously scan each surface layer of the highway to obtain relatively clear detection images.Therefore,the geological radar technology is an effective means for road structure detection and defect detection.uses a combination of forward and inverse research methods.First,the radar forward modeling is performed for the common conditions of road structures such as voids,holes,and buried pipelines.The Gpx Max software is used to simulate the radar spectrum under various conditions.The characteristics of each radar map were analyzed,and the correspondence between the road structure damage location and damage information and the radar map was established.Then,based on the actual project,radar detection was carried out to obtain the radar map of the actual road structure.Based on the forward simulation The corresponding relationship was established to invert the defects in the actual pavement structure.The main research contents of the paper are as follows:(1)The working principle of geological radar is comprehensively analyzed.Aiming at the characteristics of shallow burial depth of road structures and small defect size,research on detection of reasonable radar antenna frequencies and reasonable line spacing for road structure defect detection of different scales parameter.(2)Carry out forward modeling for defects such as voids,voids,and pipelines in road structures,and study the effects of parameters such as the dielectric parameters of the structural layer,the shape and size of the defects,and the frequency of the radar antenna on the radar spectrum.Gpr Max Radar spectra were obtained under the influence of different parameters.(3)Comprehensively analyze the radar atlas obtained in(2),establish the correspondence between the burial depth and damage level of the three types of defects in the road structure and the radar atlas,and propose to obtain the positions and sizes of the three types of defects based on the atlas analysis.And degree methods.(4)For the actual project,the geological radar was used for the actual survey,and the radar map of the actual road structure was obtained.Based on the corresponding relationship established in the forward modeling and forward modeling simulation,the defect conditions of the actual road structure were inverted,and the proposed scheme was verified.Effectiveness of the method.