基于超声相控阵和逆时偏移成像的套筒灌浆饱满度无损检测方法
Imaging-based inspection of grouted splice sleeves by reverse-time migration using an ultrasonic phased array
Received:September 23, 2021  Revised:October 28, 2021
DOI:10.7520/1001-4888-21-227
中文关键词:  装配式结构  灌浆套筒  无损检测  超声成像  逆时偏移
英文关键词:precast concrete structure  grouted splice sleeve  non-destructive testing (NDT)  ultrasonic imaging  reverse time migration
基金项目:广东省基础与应用基础研究基金项目(2019A1515011162, 2021A1515010881)
Author NameAffiliation
CHEN Zhijie School of Civil Engineering, Guangzhou University, Guangzhou 510006,Guangdong, China 
LI Zhao Jinan Rail Transit Group CO., LTD., Jinan 250014, Shandong, China 
LIU Yijie School of Civil Engineering, Guangzhou University, Guangzhou 510006,Guangdong, China 
LIU Hai* School of Civil Engineering, Guangzhou University, Guangzhou 510006,Guangdong, China 
QI Yuan 1.School of Civil Engineering, Guangzhou University, Guangzhou 510006,Guangdong, China
2.Guangzhou Women and Children's Medical Center National Children's Medical Center for South Central Region, Guangzhou 510620, Guangdong, China 
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中文摘要:
      灌浆套筒连接是装配式建筑最主要的连接方式之一,套筒的灌浆饱满度决定了装配式建筑的稳定性和抗震性。本文提出一种基于逆时偏移(RTM)成像算法的相控阵超声检测方法,可对装配式套筒连接处可能存在的灌浆缺陷进行检测,本文通过数值仿真试验和室内模型试验对所提方法的有效性进行了验证,其中数值仿真结果表明:RTM算法与传统超声全聚焦(TFM)算法相比,具有更高的成像精度和清晰度,能准确识别套筒内部的空洞、不密实等灌浆缺陷。室内试验结果表明:在RTM重构图像中,与灌浆密实套筒相比,灌浆不密实套筒的反射信号会低9dB,此特征可以识别注浆缺陷。研究结果表明本文提出的相控阵超声成像方法适用于预制结构的套筒灌浆缺陷检测。
英文摘要:
      Grouted sleeve has become one of the most important methods for connecting the prefabricated construction (PC) components. The compactness of the grouted sleeves plays a critical role in the structural safety and earthquake resistance for prefabricated construction. In this paper, an ultrasonic imaging method is proposed for the inspection of the compactness of grouted splice sleeves in PC structures by reverse time migration (RTM) using a phased array. Numerical and laboratory experiments are carried out to assess the feasibility of the proposed method. Numerical results show that the proposed RTM method can reconstruct images of the buried sleeves with a higher resolution and a greatly-improved accuracy, compared with the total focusing method (TFM). In the laboratory experiment, the insufficiently-grouted sleeve has a reflection, which is about 9 dB stronger than the fully-grouted one. The proposed ultrasonic imaging method has a great potential for inspecting the grouting quality of splice sleeves in PC constructions in the near future.
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