【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。更多还原

【Abstract】 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.更多还原