Applied Research Of The Geological Radar In The Tunnel Health Diagnosis

Along with enlargement of the underground space exploitation of the vigour, tunnel works will be getting more and more。However, with vigorous development of tunnel enterprise, the people more and more concerned about the issue of the tunnel damages, It has been affecting the normal operation of the tunnel and need a very serious problem。Ground Penetrating Radar is a medium through the use of non-continuity of the ground floor to detect the ground floor of the objectives of non-destructive testing tools, is a high-frequency electromagnetic method。Ground Penetrating Radar making use of ground penetrating radar antenna in order to launch the form of broadband short-pulse high-frequency electromagnetic waves to the ground floor of the launch, electromagnetic waves in different media interface will have a reflective, and will be received by receiving antennas, through the analysis of electromagnetic wave in time, propagation characteristics of space exploration target to achieve the spatial location, size and physical properties of such purposes。It has many good Features, fast detection, the process of the detection continuous, flexible and easy to operate, high resolution, without damaging the characteristics of detected targets and so on, it making the Ground Penetrating Radar more frequent。This article has studied the application of the principle of ground penetrating radar and has combined with diagnosis of the highway health tunnel in the practical application, has analysed the problems of the disposal of the radar images data, some are now developing so fast that the introduction of advanced filters GPR image denoising, to obtain a good de-noising effect. At the same time, some of the morphological principle of image enhancement applied to ground penetrating radar, ground penetrating radar images to facilitate feature extraction, the lining of the boundary line, the abnormal lining.1) This paper has introduced the geological radar application present situation and the prospect, also has studied the ground penetrating radar application principle and Working methods。2) Comparison of cavity lining and the lining and water-rich air from both cases, from the wave profile, the Department when the water-filled cavity after reflection interface increased as water and concrete medium of the physical properties of electromagnetic waves (dielectric constant, conductivity, etc.) significantly different, the reflection coefficient target greatly increased. Amplitude spectrum from the point of view, when the defects in the region after the water-filled measuring point geological radar frequency spectrum amplitude value than that before the decrease of water and less dense regions of the frequency spectrum amplitude value. High-frequency part was absorbed reflection for low-frequency part reflected. Therefore, in practical engineering testing to determine the tunnel lining, or whether there is any groundwater behind the intrusion, through the analysis of ground penetrating radar reflection characteristics of waves and the amplitude spectrum waveform profiles combine to determine whether there is any concrete defect of water inside.3) the morphology of ground penetrating radar to image processing to the airspace, it will be convenient, fast access to its line, and reduces human error. Makes no job experience, still can find their line. The introduction of image enhancement techniques to detect data in the lining, the attenuation of the unwanted features, highlighted the details of lining their own, unusual characteristics, in order to find out the lining does not provide a convenient compact.4) combined with ground penetrating radar in the corner of Yunnan Tin Tunnel damages in the practical application of testing to verify the ground penetrating radar to more accurately detect water damage and the lining of the tunnel structure of damages categories.Many practical problems need to be solved in Ground Penetrating Radar that it was used in the diagnosis of tunnel lining healthy。how to make the detection of ground penetrating radar data analysis more precise, how to deal with the geological environment on the effects of radar detection data and so on. many problems are worthy of further study。...