Study On Ground Penetrating Radar Detection Method Used In Under Line Layered Structure Of High-spped Railway

With the rapid development of economy and society, high-speed railway develops rapidly in our country. At present, our country has possessed the longest mileage and the largest scale which is under construction in the filed of high-speed railway. The integration of new technology and a significance symbol of modern railway is the high-speed railway, which reflects a country’s comprehensive strength. However, the under line layered structure of high-speed railway appears a few damages during running, such as cement asphalt mortar with outflow, gap between structure’s support plate and surface layer of subgrade, which limits the rapid development of high-speed railway. Ground penetrating radar is more longer and faster than other nondestructive testing methods in the aspect of detecting under line layered structure of high-speed railway, so it becomes a burning question to study the application of ground penetrating radar on detecting the disease of under line layered structure of high-speed railway.This thesis intents to investigate the application of GPR on detecting under line layered structure of high-speed railway from the following three aspects:First, developing GPR ’s data processing software. This thesis intents to introduce GPR ’s data formats, the image display mode and the method of processing data. The compiled GPR ’s data processing software is based on MATLAB development platform.Second, confirming detecting and processing parameters by model experiment and theoretical analysis. By using GPR to detect the model that possesses diseases and on the basis of theoretical analysis, we will obtain these acquisition parameters of applying GPR to detect under line layered structure of high-speed railway, such as antennary frequency, sampling interval, adopt frequency and so on. Meanwhile by using complied software and commercial software to process the collected data, we could verify the reliability of compiled software and obtain the processing parameters.Third, applying the developed system. With the detecting and processing parameters from model experiment, we use GPR to detect under line layered structure of high-speed railway, which has not been opened and has been opened, then we acquire feature images on disease of under line layered structure of high-speed railway.By using the detecting and processing system to detect under line layered structure of high-speed railway, we put forward these feature images on diseases, such as cement asphalt mortar with outflow, gap between structure’s support plate and surface layer of subgrade. Forming a relatively perfect detection system will provide technical support for later detection...