用层析成像方法检测隐蔽工程结构缺陷
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摘要
计算机层析成像技术(Computer Tomograghy)简称CT,是一项快速发展的现代无损检测技术。CT因分辨率高,能准确反映探测对象的细部结构,可用于对隐蔽结构工程的缺陷和细微地质构造进行准确精细检测。本文以超声波CT技术为例简述了将该项技术应用于地下隐蔽工程检测的理论框架和工程技术要点,以大型灌注桩基础的桩端注浆质量检测和地下群桩穿孔位置检测等实际工程实例说明在工程中联合应用各种CT检测技术的方法。这两项检测实例来源于长江大桥和跨海大桥的超大型群桩基础,是在国际上首次完成的地下120米深度桩基础灌浆效果检测和成桩质量检验的实例。
CT is the abbreviation for Computer Tomography and is a rapid developing modern non-destructive detecting technology.Because of high resolution,CT can accurately reflect the detail of detected object,so it can be used in fine accurate detection of defects in hidden engineering structure.The theory frame and main technical points for applying this technology to the underground concealed work detection are illustrated by ultrasonic CT technology as an example.Two cases are stated in this paper.They are: checking distribution of post grouting at bottom of long piles by ultrasonic CT,and checking the quality of piles by joint application of ultrasonic CT and electromagnetic CT.These two cases are from the super-large pile group foundation of Yangtze River Bridge and a cross-sea bridge and are the first example in world to check grouting effect for pile foundation and pile quality of piles at 120m underground.
CT is the abbreviation for Computer Tomography and is a rapid developing modern non-destructive detecting technology.Because of high resolution,CT can accurately reflect the detail of detected object,so it can be used in fine accurate detection of defects in hidden engineering structure.The theory frame and main technical points for applying this technology to the underground concealed work detection are illustrated by ultrasonic CT technology as an example.Two cases are stated in this paper.They are: checking distribution of post grouting at bottom of long piles by ultrasonic CT,and checking the quality of piles by joint application of ultrasonic CT and electromagnetic CT.These two cases are from the super-large pile group foundation of Yangtze River Bridge and a cross-sea bridge and are the first example in world to check grouting effect for pile foundation and pile quality of piles at 120m underground.
引文
[1]刘盛东,李承华.地震走时层析成像算法与比较[J].中国矿业大学学报,2000,29(2):211-214.(Liu Shengdong,Li Chenghua,Algorithm and comparison of seismic travel time computerized tomography technique[J].Journal of China University of Mining and Technology,2000,29(2):211-214.(in Chinese))
[2]王运生,王家映,顾汉明.弹性波CT关键技术与应用实例[J].工程勘察,2005,(3):66-68.(Wang Yunshen,Wang Jiayin,Gu Hanming.Key technology of elastic wave ct and practical cases[J].Geotechnical Investigation&Surveying,2005,(3):66-68.(in Chinese))
[3]宋文荣,吴仪芳,刘建达,等.电磁波层析成像技术(CT)在地基勘探中的应用[J].地震学刊,1994,(2):42-46.(Song Wengrong,Wu Yifang,Liu Jiandan,et al.Electromagnetic CT in foundation exploration[J].Journal of Seismology,1994,(2):42-46.(in Chinese))
[4]王五平,宋人心,傅翔,等.声波CT测试系统及其在大坝混凝土质量探测中的应用[J].水利水电技术,2004,35(10):56-77.(Wang Wuping,Song Renxin,Fu Xiang,et al.Acoustic CT testing system and its application of dam concrete[J].2004,35(10):56-77.(in Chinese))
[5]南金生,马建军.超声波CT成像技术在桩基检测中的应用[J].地震学刊,1999,(4):43-46,(Nan Jinsheng,Ma Jianjun.Application of ultrasonic wave CT in pile foundation[J].Journal of Seismology,1999,(4):43-46,(in Chinese))
[6]刘红桂,刘建达,许汉刚,等.井间超声波层析成像及其在岩溶勘察中的应用[J].地震学报,2003,25(4):415~421.(Liu Honggui,Liu Jianda,Xu Hangang,et al.Crosshole ultrasonic tomography and its application in karstdevelopment[J].Acta Seismologica Sinica,2003,25(4):415-421Jul.,2003(in Chinese))
[7]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型[J].岩土工程学报,2006,28(9):1148-1152.(Huang Yonglin,Liu Jianda,Xu Hangang,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))
[8]雷宛,肖宏跃,钟韬,等.灌浆质量检测的声波CT法及其与综合检测效果的对比[J].成都理工大学学报(自然科学版),2006,33(4):336-344.(Lai Yao,Xiao Hongyu,Zhong Tao,et al.Method of sonic CT in checking the quality of pile-end post-grouting piles and comparing results among different methods[J].Journal of Chengdu University of Technology(Science&Technology Edition),2006,33(4):336-344.(in Chinese))
[9]戴国亮,龚维明,童小东,桩端后压浆效果检测技术[J].施工技术,2005,34(1):74-77.(Dai Guoliang,Gong Weiming,Tong Xiaodong.Detection technology for grouting effects of pile-end post-grouting piles[J Construction Technology,2005,34(1):74-77.(in Chinese))
[10]李昌驭,赵建华,许斌等,钻孔灌注桩桩端后压浆机制及效果检测[J].工程质量,2005,(2):46-49.(Li Changyu,Zhao Jianhua,Xu Bin,et al.Method of pileend post-grouting piles and checking effects[J].Construction Quality,2005,(2):46-49.(in Chinese)
[2]王运生,王家映,顾汉明.弹性波CT关键技术与应用实例[J].工程勘察,2005,(3):66-68.(Wang Yunshen,Wang Jiayin,Gu Hanming.Key technology of elastic wave ct and practical cases[J].Geotechnical Investigation&Surveying,2005,(3):66-68.(in Chinese))
[3]宋文荣,吴仪芳,刘建达,等.电磁波层析成像技术(CT)在地基勘探中的应用[J].地震学刊,1994,(2):42-46.(Song Wengrong,Wu Yifang,Liu Jiandan,et al.Electromagnetic CT in foundation exploration[J].Journal of Seismology,1994,(2):42-46.(in Chinese))
[4]王五平,宋人心,傅翔,等.声波CT测试系统及其在大坝混凝土质量探测中的应用[J].水利水电技术,2004,35(10):56-77.(Wang Wuping,Song Renxin,Fu Xiang,et al.Acoustic CT testing system and its application of dam concrete[J].2004,35(10):56-77.(in Chinese))
[5]南金生,马建军.超声波CT成像技术在桩基检测中的应用[J].地震学刊,1999,(4):43-46,(Nan Jinsheng,Ma Jianjun.Application of ultrasonic wave CT in pile foundation[J].Journal of Seismology,1999,(4):43-46,(in Chinese))
[6]刘红桂,刘建达,许汉刚,等.井间超声波层析成像及其在岩溶勘察中的应用[J].地震学报,2003,25(4):415~421.(Liu Honggui,Liu Jianda,Xu Hangang,et al.Crosshole ultrasonic tomography and its application in karstdevelopment[J].Acta Seismologica Sinica,2003,25(4):415-421Jul.,2003(in Chinese))
[7]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型[J].岩土工程学报,2006,28(9):1148-1152.(Huang Yonglin,Liu Jianda,Xu Hangang,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))
[8]雷宛,肖宏跃,钟韬,等.灌浆质量检测的声波CT法及其与综合检测效果的对比[J].成都理工大学学报(自然科学版),2006,33(4):336-344.(Lai Yao,Xiao Hongyu,Zhong Tao,et al.Method of sonic CT in checking the quality of pile-end post-grouting piles and comparing results among different methods[J].Journal of Chengdu University of Technology(Science&Technology Edition),2006,33(4):336-344.(in Chinese))
[9]戴国亮,龚维明,童小东,桩端后压浆效果检测技术[J].施工技术,2005,34(1):74-77.(Dai Guoliang,Gong Weiming,Tong Xiaodong.Detection technology for grouting effects of pile-end post-grouting piles[J Construction Technology,2005,34(1):74-77.(in Chinese))
[10]李昌驭,赵建华,许斌等,钻孔灌注桩桩端后压浆机制及效果检测[J].工程质量,2005,(2):46-49.(Li Changyu,Zhao Jianhua,Xu Bin,et al.Method of pileend post-grouting piles and checking effects[J].Construction Quality,2005,(2):46-49.(in Chinese)
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