电磁波CT技术在钻孔灌注桩后压浆效果检测中的应用研究
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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。
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.
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.
引文
[1]黄生根,彭从文.灌注桩后注浆技术原理与工程实践[M].北京:中国地质大学出版社,2016.(HUANG Sheng-gen,PENG Cong-wen.Principle and engineering practice of post-grouting technology[M].Beijing:China University of Geosciences Press,2016.(in Chinese))
[2]何剑,赵海生,谷秀萍,等.后注浆砼灌注的检测技术[C]//中国西北部重大工程地质问题论坛.西安,2002.(HEJian,ZHAO Hai-sheng,GU Xiu-ping,et al.Inspection technique of concrete filling pile after grout injection[C]//Forum on Major Engineering Geology Issues in Northwest China.Xi'an,2002.(in Chinese))
[3]黄生根,龚维明.CT技术在超长桩后压浆效果检测中的应用研究[C]//第一届中国水利水电岩土力学与工程学术讨论会.昆明,2006.(HUANG Sheng-gen,GONG Wei-ming.Application of CT technology in the detection of super-long pile post-grouting effect[C]//The 1st China Water Conservancy and Hydropower Geotechnical and Engineering Symposium.Kunming,2006.(in Chinese))
[4]黄永林,刘建达,许汉刚,等.用超声波CT检测深桩基础压浆的分布与成形[J].岩土工程学报,2006,28(9):1148-1152.(HUANG Yong-lin,LIU Jian-da,XU Han-gang,et al.Checking distribution of post grouting at bottom of long piles by ultrasonic CT[J].Chinese Journal of Geotechnical Engineering,2006,28(9):1148-1152.(in Chinese))
[5]李昌驭,赵建华,许斌,等.钻孔灌注桩桩端后压浆机理及效果检测[J].工程质量,2005(2):46-49.(LI Chang-yu,ZHAO Jian-hua,XU Bin,et al.Mechanism&performance test of bored pile with post grouting at base[J].Engineering Quality,2005(2):46-49.(in Chinese))
[2]何剑,赵海生,谷秀萍,等.后注浆砼灌注的检测技术[C]//中国西北部重大工程地质问题论坛.西安,2002.(HEJian,ZHAO Hai-sheng,GU Xiu-ping,et al.Inspection technique of concrete filling pile after grout injection[C]//Forum on Major Engineering Geology Issues in Northwest China.Xi'an,2002.(in Chinese))
[3]黄生根,龚维明.CT技术在超长桩后压浆效果检测中的应用研究[C]//第一届中国水利水电岩土力学与工程学术讨论会.昆明,2006.(HUANG Sheng-gen,GONG Wei-ming.Application of CT technology in the detection of super-long pile post-grouting effect[C]//The 1st China Water Conservancy and Hydropower Geotechnical and Engineering Symposium.Kunming,2006.(in Chinese))
[4]黄永林,刘建达,许汉刚,等.用超声波CT检测深桩基础压浆的分布与成形[J].岩土工程学报,2006,28(9):1148-1152.(HUANG Yong-lin,LIU Jian-da,XU Han-gang,et al.Checking distribution of post grouting at bottom of long piles by ultrasonic CT[J].Chinese Journal of Geotechnical Engineering,2006,28(9):1148-1152.(in Chinese))
[5]李昌驭,赵建华,许斌,等.钻孔灌注桩桩端后压浆机理及效果检测[J].工程质量,2005(2):46-49.(LI Chang-yu,ZHAO Jian-hua,XU Bin,et al.Mechanism&performance test of bored pile with post grouting at base[J].Engineering Quality,2005(2):46-49.(in Chinese))