The Application Research Of The Ground Penetrating Radar In Advanced Geological Prediction Of Tunnels And Testing Of Lining

Into the twenty-first century, in order to meet the needs of rapid economic development,China has further increased its investment in infrastructure, promoted the rapid development of high-speed railway in China. To meet the technical requirements of high-speed railway in complex terrain areas, require a lot of the construction of tunnels. In the tunnel excavation process, we need to know in advance the geological changes in Front of Face for the tunnel to provide a more accurate geological data in order to rationalize excavation of footage in time and amend the construction plan, to strengthen security measures to avoid accidents. In addition, the process of tunnel construction and completion of quality assessment of quality acceptance testing, we need fast, accurate, and complete control of tunnel construction with or without quality defects. Ground Penetrating Radar is the use of high-frequency electromagnetic pulse to probe the subsurface media of a geophysical exploration methods, because of its high resolution ratio, easy operation, nondestructive testing, image visual advantages, such as tunnel geological prediction and the lining of detection are a wide range of applications.Ground Penetrating Radar in electromagnetic theory developed on the basis of, Electromagnetic field theory and the propagation of electromagnetic waves is the theoretical basis of ground penetrating radar technology. From the basic theory of electromagnetic fields Maxwell's equations cuts introduced plane wave propagation characteristics and propagation in the medium and the electromagnetic properties of the medium; in learning at home and abroad radar technology on the basis of research data, through the Xiang Gui Railway, Gui Guang Railway,Lan Yu Railway and your line lining tunnel geological prediction and detection of a wide range of practice, theory and application of radar technology and accumulated experience.(1) summarized the application of the working methods in collecting GPR data and data interpretation methods, expatiated on notes in the data collection process, data processing procedures and methods of target identification.(2) summarized the tunnel geological prediction often encountered in the cave, broken belt, soft interlayer, water-rich rock and other adverse geological forecasting methods and their profile on the radar waveform characteristics.(3) summarizes the detection of tunnel lining the hole often encountered, the quality of concrete is not dense with other defect detection methods and their profile on the radar waveform characteristics.Currently, ground penetrating radar has been widely used in civil engineering, environmental monitoring, archaeological research, basic geological survey, mineral exploration and other fields, has become a routine detection technology. With the continuous development of science and technology, ground penetrating radar applications will become more widespread, its application in the engineering field will also be more in-depth, resolution ratio and accuracy will also continue to increase.