基于Tikhonov正则化的灌注桩超声波衰减成像方法
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摘要
采用Tikhonov正则化方法对一带有蜂窝缺陷体的混凝土灌注桩进行了超声波衰减图像重建,重建图像清晰显示出桩内蜂窝体的位置与形状,与速度成像结果相比较,两者吻合较好。又对一桥梁工程灌注桩进行了衰减图像重建与速度图像重建,所得图像均清晰显示出缺陷体的部位,且两者较为符合,后经钻孔抽芯验证,其结果证明了该衰减成像方法的有效性。实际工程中宜采用速度与衰减系数双参数进行成像,以相互验证,提高检测的可靠性。
Tikhonov regularization method is used on ultrasonic attenuation tomography for a cast-in-place pile model with a honeycomb defect.The reconstruction image clearly shows the place and shape of the defect,which is well consistent with velocity image.In addition,Tikhonov regularization method is used on the attenuation image reconstruction for a cast-in-place pile of bridge engineering,in which good consistence is also obtained.The results of core-drilling verify the effectiveness of the attenuation tomography.The dual-parameter tomography should be carried out in practical engineering testing,in order to verify each other and improve testing reliability.
Tikhonov regularization method is used on ultrasonic attenuation tomography for a cast-in-place pile model with a honeycomb defect.The reconstruction image clearly shows the place and shape of the defect,which is well consistent with velocity image.In addition,Tikhonov regularization method is used on the attenuation image reconstruction for a cast-in-place pile of bridge engineering,in which good consistence is also obtained.The results of core-drilling verify the effectiveness of the attenuation tomography.The dual-parameter tomography should be carried out in practical engineering testing,in order to verify each other and improve testing reliability.
引文
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[2]曹获.层析成像二阶段射线追踪技术在工程中的应用[J].岩土力学,2005,26(7):1157-1160.(CAO Huo.Application of computerized tomography two-phrase ray tracing technique to civil engineering[J].Rock and Soil Mechanics,2005,26(7):1157-1160.(in Chinese))
[3]FRANCOIS S,PATRICE R,GERARD B.Measurement of alkali-silica reaction progression by ultrasonic waves attenuation[J].Cement and Concrete Research,2007,37(6):948-956.
[4]JTG/T F81—01—2004公路工程基桩动测技术规程[S].北京:人民交通出版社,2004.(JTG/T F81—01—2004Technical specification of dynamic pile tests for highway engineering[S].Beijing:China Communications Press,2004.(in Chinese))
[5]张治泰,邱平.超声波在混凝土质量检测中的应用[M].北京:化学工业出版社,2006.(ZHANG Zhi-tai,QIU Ping.The application of ultrasonic to test the concrete quality[M].Beijing:Chemical Industry Press,2006.(in Chinese))
[6]刘金砺,李大展,高文生,等.桩基工程技术进展2009[M].北京:中国建筑工业出版社,2009:527-530.(LIU Jin-li,LI Da-zhan,GAO Wen-sheng,et al.Development of pile foundation technique2009[M].Beijing:China Architecture&Building Press,2009:527-530.(in Chinese))
[7]宋常瑜,裴正林,狄帮让,等.小波多尺度井间地震衰减层析成像[J].石油地球物理勘探,2007,42(1):30-33.(SONG Chang-yu,PEI Zheng-lin,DI Bang-rang,et al.Multi-scaled seismic-attenuated cross-hole tomographic imaging of wavelet[J].Oil Geophysical Prospecting,2007,42(1):30-33.(in Chinese))
[8]赵连锋,王卫民,姚振兴.逐次线性化衰减层析成像方法研究[J].地球物理学报,2004,47(4):691-696.(ZHAO Lian-feng,WANG Wei-min,YAO Zhen-xing.Seismic attenuation tomography using the successive linearization method[J].Chinese Journal of Geophysics,2004,47(4):691-696.(in Chinese))
[9]TIKHONOV A N,ARSENIN V Y.Solutions of ill-posed problems[M].New York:John Wiley&Sons,1977.
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