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Numerical Simulation of Ground Penetrating Radar Electromagnetic Wave Propagation in Rigid Pavement with Voids Based on FDTD

Author: XieXiaoLi
Tutor: ZhangZuo
School: Zhengzhou University
Course: Road and Railway Engineering
Keywords: Ground Penetrating Radar FDTD Rigid Pavement Void Numerical Simulation
CLC: U418.6
Type: Master's thesis
Year: 2011
Downloads: 91
Quote: 0
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Abstract


Void is one of the common diseases of rigid pavement. How to accurately determine the location and size of the Void, and take timely and effective remedial measures to improve the use of rigid pavement performance and extend the life of the pavement structure is of great significance. Ground-penetrating radar (GPR) with its rapid, non-destructive, the advantages of Rigid Pavement empty test shows a good prospect in the field, but in the use of ground-penetrating radar detection Void automated interpretation of radar images lower evaluation more human factors, leading to the interpretation of the results is often with a certain degree of subjectivity, and the for rigid pavement Void difficult to achieve the effect of the quantitative identification, making ground-penetrating radar the empty detection field of Rigid Pavement application there are some limitations. FDTD (Finite Difference in Time Domain FDTD) method developed in recent years a high-frequency electromagnetic field numerical methods, physical optics principle-based and fast computing, storage, low generic procedures and appropriate The advantage of parallel computing, has been widely used in the field of electromagnetic simulation. This article will be carried out based on the FDTD numerical simulation of rigid pavement Void radar electromagnetic wave. The main contents and conclusions are as follows: 1. Based on the basic theory of electromagnetic waves, starting from the differential form of Maxwell's curl equations differential discrete two-dimensional finite difference time domain correction equation is derived, by using CPML method is applied to the PML, the establishment of Based on the two-dimensional finite difference time domain method of ground penetrating radar electromagnetic wave modeling method, and the preparation of the corresponding simulation program; gas charge and water charge and void rigid pavement structure ground-penetrating radar electromagnetic wave propagation model. Off empty set different parameters, and simulating the programs under the different horizontal and vertical size of the two-dimensional radar reflection image, in this study based on the characteristics of the board Void radar reflectivity signal; 3. ground-penetrating radar waves in the round, V-shaped propagation model Void rigid pavement structure, board Void area round and V-shaped radar reflectivity characteristics of the image, and draw the corresponding conclusions; based on ground-penetrating radar electromagnetic wave propagation model in different Void road structure in the corresponding experimental design, the measured GPR corresponding analog radar images were analyzed to test the feasibility of the numerical simulation method and effectiveness. The results showed that: 2D-FDTD method simulation of ground penetrating radar electromagnetic wave propagation in the Void rigid pavement structure, the resulting two-dimensional radar reflection image with the measured radar map is closer to be able to identify the different conditions Void disease. The results of this study provide a basis for interpretation of ground-penetrating radar image, laid the theoretical foundation for the further development of ground-penetrating radar detection Inversion of the Void under the rigid pavement.

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CLC: > Transportation > Road transport > Road works > Road maintenance and repairs > Road maintenance and repair
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