###### Abstract  
The post-routing technology can effectively improve the bearing capacity and reliability of foundation piles, and it is of great academic and economic significance to evaluate the effect of post-grouting. However, in general, the evaluation of the effect of post-grouting slurry on foundation piles is still relatively single, and most researchers only test the improvement of the bearing characteristics of post-grouting piles, but there are few research results on the distribution state of slurry consolidation and the range of the reinforced soil. In this paper, elastic wave CT was used to detect the bridge piles of Taizhou Bay Du Xiaipu Bridge, and elastic wave CT technology was applied to the detection of the post-grouting effect of foundation piles experimentally. The spatial distribution characteristics of the underground grouting reinforcement area were revealed from the perspective of visualization, and the influencing factors of the elastic wave inversion results were analyzed. The conclusions obtained from elastic wave CT detection were similar to those of electromagnetic wave CT, and the laws are basically consistent with the current engineering experience, reflecting the applicability of using elastic wave CT to detect the effect of post-grouting of pile foundation. elastic wave; post-grouting; tomography +
Footnote †: journal: Applied Sciences  
**Citation:** [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Study on the Application of Elastic Wave CT Technique to Detect the Effect of Post-Grouting of Pile Foundation. **Technique to Detect the Effect of Post-Grouting of Pile Foundation. ** Post-Grouting of Pile Foundation. **Citation:** [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Study on the Application of Elastic Wave CT Technique to Detect the Effect of Post-Grouting of Pile Foundation. **Technique to Detect the Effect of Post-Grouting of Pile Foundation. ** Post-Grouting of Pile Foundation. **Citation:** [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Study on the Application of Elastic Wave CT Technique to Detect the Effect of Post-Grouting of Pile Foundation. **Technique to Detect the Effect of Post-Grouting of Pile Foundation. slurry was mostly distributed in thin layers and discontinuous, and the cement slurry at the bottom of the pile was still partially unconsolidated. [PERSON] et al. [6] used ultrasonic CT and electromagnetic CT techniques to test and evaluate the post-pressure effect of the main pier group piles of the Sutong Bridge, and combined with the results of the later drilling and coring, it was considered feasible to use these two methods together to test the post-grouting effect of deep and long piles. [PERSON] et al. [7] used ultrasonic CT to detect the effect of pile bottom compression slurry in the Yangtze River Bridge and solved several key technical problems in the test pile testing, and the testing results showed images of the distribution range of pressed-in cement slurry. Meanwhile, [PERSON], [PERSON], [PERSON], [PERSON], [PERSON], and [PERSON] used cross-well elastic wave CT technology in the field of engineering tests successively [8; 9; 10; 11; 12; 13; 14; 15; 16]. Its application covers the detection of unfavorable geological conditions, the detection of existing engineering hidden danger, the detection of unfavorable geological and treatment effects of engineering hidden danger, the quality appraisal of concrete structure, etc., which have made a lot of achievements. In this paper, drawing on the fruitful results and experience gained from elastic wave CT technology in the fields of geological structure and oil and gas exploration, elastic wave CT technology was experimentally applied to the detection of the effect of post-grouting of foundation piles.