Analysis of Ground Penetrating Radar Wave Field Characteristics of Dam Face Disengaging Repaired by Polymer Grouting

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Analysis of Ground Penetrating Radar Wave Field Characteristics of Dam Face Disengaging Repaired by Polymer Grouting

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[1]FANG Hongyuan,ONG Zhifeng,UE Binghan,et al.Analysis of Ground Penetrating Radar Wave Field Characteristics of Dam Face Disengaging Repaired by Polymer Grouting[J].Journal of Zhengzhou University (Engineering Science),2024,45(03):1-6.[doi:10.13705/j.issn.1671-6833.2023.06.012]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 45 Number of periods: 2024 03 Page number: 1-6 Column: Public date: 2024-04-20

Title:: Analysis of Ground Penetrating Radar Wave Field Characteristics of Dam Face Disengaging Repaired by Polymer Grouting

Author(s):: FANG Hongyuan ¹; 2; ONG Zhifeng ¹; 2; UE Binghan ¹; 2; LEI Jianwei ¹; 2; 1. Yellow River Laboratory, Zhengzhou University, Zhengzhou 450001, China; 2. National Local Joint Engineering Laboratory of Major Infrastructure Testing and Rehabilitation Technology, Zhengzhou University, Zhengzhou 450001, China

Keywords:: dams; polymer grouting; finite-difference time-domain; face disengaging; ground penetrating radar; wave field characteristics

CLC:: TV641. 43

DOI:: 10.13705/j.issn.1671-6833.2023.06.012

Abstract:: In view of the effect of polymer grouting in repairing the dam face disengaging, the ground penetrating radar wave field of the dam face disengaging was studied. A calculation models of the dam with panel disengaging repaired by polymer grouting was established based on the finite-difference time-domain method and the perfectly matched layers boundary conditions. The effects of radar center frequency, degree of panel disengaging repair, size of disengaging area, face thickness and reinforcement on ground penetrating radar (GPR) wave field characteristics of the dam face disengaging repaired by polymer grouting were analyzed. The results showed that the resolution of GPR profile increased gradually with the increase of the excitation source center frequency. The horizontal interfacial reflection wave generated in the GPR profiles increased with the length of the disengaging area. The time interval between horizontal reflectors on the GPR profiles increased with the depth of the disengaging area. The amplitudes of the bypassed and diffracted waves in the disengaging repair area decreased with the increase of the dam face thickness. The electromagnetic waves emitted by the GPR encountered the steel reinforcement and generated a wave field. The reflected waves at the upper and lower interfaces of the disengaging area were divided by the strong bypass waves, which made it difficult to judge the horizontal length of the reflected waves.

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Last Update: 2024-04-29