Application of cross-hole electromagnetic wave CT in detection of post-grouting effect
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摘要: 利用MATLAB对不同后压浆情况进行数值模拟,对水泥浆的扩散方式和加固区的形态分布规律进行了分析研究,并结合台州湾杜下浦大桥桥桩CT检测成果,得到以下主要结论：①ART和SIRT算法均是收敛的,ART算法迭代10次,SIRT算法迭代50次,反演结果已趋于稳定;②基于直射理论的ART和SIRT算法均可以识别出模型桩体下界面、桩端固结体形态和浆液上返高度,但整体而言SIRT算法效果更好;③台州湾杜下浦大桥的桥桩试验表明,根据反演结果推测的压浆前后桩周地下介质分布状态与实际情况有较好的符合度,这一定程度上体现了数值模拟中所总结的压浆效果识别规律在工程实际中的适用性。Abstract: 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.
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Keywords:
- electromagnetic wave /
- post grouting /
- CT /
- absorption coefficient
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