水利学报2026，Vol.57Issue(5)：691-703,715,14.DOI:10.3724/j.slxb.20250513
混凝土防渗墙弹性波CT法检测观测系统优化与应用
Optimization and application of observation systems for elastic wave CT Testing of concrete cut-off walls
摘要
Abstract
This study aims to assess the applicability of various observation systems for evaluating the quality of con-crete cut-off walls using the elastic wave CT method,focusing on their accuracy and reliability in detecting internal defects within the concrete.Five distinct observation system layouts were employed to capture the propagation signals of the simulating elastic wave source within the concrete cut-off wall.The internal structure of the concrete cut-off wall was reconstructed utilizing the shortest-path ray algorithm and the Gauss-Newton inversion method.The perfor-mance of each system layout in signal acquisition,data processing,and image reconstruction was compared and ana-lyzed through experiments.The results show that the fixed observation system layout demonstrates superior perfor-mance when the depth of the cut-off wall is shallow and the equipment can provide full coverage.The positioning error can be controlled within 0.5 m,with a signal-to-noise ratio higher than 25 dB,ensuring high detection precision.For deep walls exceeding the coverage range of the equipment,mobile observation system layouts show significant advan-tages.Among them,the balanced and optimized mobile observation system layout is more suitable for rapid,large-scale screening.A practical engineering case confirmed that the balanced and optimized observation system can suc-cessfully identify the local defects in a 61 m deep cut-off wall.Through comparative analysis,this study eatablishes a quantitative selection criteria for observation systems based on indicators such as positioning error,relative wave velocity error,and signal-to-noise ratio.关键词
弹性波CT法/混凝土防渗墙/观测系统/无损检测/图像重建Key words
elastic wave CT/concrete cut-off wall/observation system/non-destructive detection/image reconstruction分类
建筑与水利引用本文复制引用
赵祥,张清明,周杨,杨磊,李长征,李毕德..混凝土防渗墙弹性波CT法检测观测系统优化与应用[J].水利学报,2026,57(5):691-703,715,14.基金项目
黄河水利科学研究院院科技发展基金专项项目(黄科发202214) （黄科发202214）
国家自然科学基金联合基金项目(U2243229) （U2243229）
