Recent Advances in the GPR Detection of Grouting Defects behind Shield Tunnel Segments

Injecting grout into the gaps between tunnel shield segments and surrounding rocks can reduce ground subsidence and prevent ground water penetration. However, insufficient grouting and grouting defects may cause serious geological disasters. Ground penetrating radar (GPR) is widely used as a nondest...

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Autores principales:	Ming Peng, Dengyi Wang, Liu Liu, Zhenming Shi, Jian Shen, Fuan Ma
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	ground penetrating radar nondestructive testing tunnel shield segment grouting concrete structure defect detection Science Q
Acceso en línea:	https://doaj.org/article/18a6f7b7391f4dfa89bac0b9f8d1da9e
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spelling	oai:doaj.org-article:18a6f7b7391f4dfa89bac0b9f8d1da9e2021-11-25T18:54:37ZRecent Advances in the GPR Detection of Grouting Defects behind Shield Tunnel Segments10.3390/rs132245962072-4292https://doaj.org/article/18a6f7b7391f4dfa89bac0b9f8d1da9e2021-11-01T00:00:00Zhttps://www.mdpi.com/2072-4292/13/22/4596https://doaj.org/toc/2072-4292Injecting grout into the gaps between tunnel shield segments and surrounding rocks can reduce ground subsidence and prevent ground water penetration. However, insufficient grouting and grouting defects may cause serious geological disasters. Ground penetrating radar (GPR) is widely used as a nondestructive testing (NDT) method to evaluate grouting quality and determine the existence of defects. This paper provides an overview of GPR applications for grouting defect detection behind tunnel shield segments. State-of-the-art methodologies, field cases, experimental tests and signal processing methods are discussed. The reported field cases and model test results show that GPR can detect grouting defects behind shield tunnel segments by identifying reflected waves. However, some subsequent problems still exist, including the interference of steel bars and small differences in the dielectric constants among media. Recent studies have focused on enhancing the signal-to-noise ratio and imaging methods. Advanced GPR signal processing methods, including full waveform inversion and machine learning methods, are promising for detecting imaging defects. Additionally, we conduct a preliminary experiment to investigate environmental noise, antenna configuration and coupling condition influences. Some promising topics, including multichannel configuration, rapid evaluation methods, elastic wave method scanning equipment for evaluating grout quality and comprehensive NDT methods, are recommended for future studies.Ming PengDengyi WangLiu LiuZhenming ShiJian ShenFuan MaMDPI AGarticleground penetrating radarnondestructive testingtunnel shield segmentgroutingconcrete structuredefect detectionScienceQENRemote Sensing, Vol 13, Iss 4596, p 4596 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	ground penetrating radar nondestructive testing tunnel shield segment grouting concrete structure defect detection Science Q
spellingShingle	ground penetrating radar nondestructive testing tunnel shield segment grouting concrete structure defect detection Science Q Ming Peng Dengyi Wang Liu Liu Zhenming Shi Jian Shen Fuan Ma Recent Advances in the GPR Detection of Grouting Defects behind Shield Tunnel Segments
description	Injecting grout into the gaps between tunnel shield segments and surrounding rocks can reduce ground subsidence and prevent ground water penetration. However, insufficient grouting and grouting defects may cause serious geological disasters. Ground penetrating radar (GPR) is widely used as a nondestructive testing (NDT) method to evaluate grouting quality and determine the existence of defects. This paper provides an overview of GPR applications for grouting defect detection behind tunnel shield segments. State-of-the-art methodologies, field cases, experimental tests and signal processing methods are discussed. The reported field cases and model test results show that GPR can detect grouting defects behind shield tunnel segments by identifying reflected waves. However, some subsequent problems still exist, including the interference of steel bars and small differences in the dielectric constants among media. Recent studies have focused on enhancing the signal-to-noise ratio and imaging methods. Advanced GPR signal processing methods, including full waveform inversion and machine learning methods, are promising for detecting imaging defects. Additionally, we conduct a preliminary experiment to investigate environmental noise, antenna configuration and coupling condition influences. Some promising topics, including multichannel configuration, rapid evaluation methods, elastic wave method scanning equipment for evaluating grout quality and comprehensive NDT methods, are recommended for future studies.
format	article
author	Ming Peng Dengyi Wang Liu Liu Zhenming Shi Jian Shen Fuan Ma
author_facet	Ming Peng Dengyi Wang Liu Liu Zhenming Shi Jian Shen Fuan Ma
author_sort	Ming Peng
title	Recent Advances in the GPR Detection of Grouting Defects behind Shield Tunnel Segments
title_short	Recent Advances in the GPR Detection of Grouting Defects behind Shield Tunnel Segments
title_full	Recent Advances in the GPR Detection of Grouting Defects behind Shield Tunnel Segments
title_fullStr	Recent Advances in the GPR Detection of Grouting Defects behind Shield Tunnel Segments
title_full_unstemmed	Recent Advances in the GPR Detection of Grouting Defects behind Shield Tunnel Segments
title_sort	recent advances in the gpr detection of grouting defects behind shield tunnel segments
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/18a6f7b7391f4dfa89bac0b9f8d1da9e
work_keys_str_mv	AT mingpeng recentadvancesinthegprdetectionofgroutingdefectsbehindshieldtunnelsegments AT dengyiwang recentadvancesinthegprdetectionofgroutingdefectsbehindshieldtunnelsegments AT liuliu recentadvancesinthegprdetectionofgroutingdefectsbehindshieldtunnelsegments AT zhenmingshi recentadvancesinthegprdetectionofgroutingdefectsbehindshieldtunnelsegments AT jianshen recentadvancesinthegprdetectionofgroutingdefectsbehindshieldtunnelsegments AT fuanma recentadvancesinthegprdetectionofgroutingdefectsbehindshieldtunnelsegments
_version_	1718410572846858240

Recent Advances in the GPR Detection of Grouting Defects behind Shield Tunnel Segments

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