Application of cross-hole electromagnetic wave CT in detection of post-grouting effect

Different post grouting conditions are simulated by using MATLAB, and the laws of the diffusion pattern of the cement slurry and the distribution of the shape of the reinforcement zone are analyzed. Combined with the CT detection results of piles of Duxiapu Bridge in Taizhou Bay, the following main conclusions are drawn: (1) ART and SIRT algorithms are convergent, the inversion results become stable when the ART algorithm iterates 10 times and the SIRT algorithm iterates 50 times. (2) Both the ART and SIRT algorithms based on the straight-line theory can identify the interface of the model piles, the shape of the pile-end consolidation, and the height of the slurry, and the SIRT algorithm is better in general. (3) The pile tests of Duxiapu Bridge in Taizhou Bay show that the distribution of underground media around the piles predicted by the inversion results is in good agreement with the actual situation, which reflects the applicability of the identification laws of the grouting effect summarized in numerical simulation in engineering practice to some extent.