Application of Impact Imaging Method in Void Detection
of a Steel Shell&nbsp;Concrete
Interface in ShenzhenZhongshan Link Immersed Tunnel

ZHANG Changliang; LI Songhui; ZHANG Yan; PENG Yingjun; LIU Xunnan; BAI Bing

doi:10.3973/j.issn.2096-4498.2022.12.016

2022 , Vol. 42 >Issue 12: 2138 - 2147

DOI: https://doi.org/10.3973/j.issn.2096-4498.2022.12.016

Application of Impact Imaging Method in Void Detection of a Steel Shell Concrete Interface in ShenzhenZhongshan Link Immersed Tunnel

ZHANG Changliang ,
LI Songhui ,
ZHANG Yan ,
PENG Yingjun ,
LIU Xunnan ,
BAI Bing

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(1. Shenzhong Link Management Center, Zhongshan 528400, Guangdong, China; 2. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China)

Online published: 2023-01-09

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Abstract

The ShenzhenZhongshan link immersed tunnel first adopts steel shell concrete structure on a large scale in China. The new structural type is complex, voids easily form at the interface of steel plate and coagulation during selfcompacting concrete pouring, and the local void will lead to the reduction of compressive strength and further affects the overall safety of the structure. A case study is conducted on the ShenzhenZhongshan link immersed tunnel to realize the rapid and accurate detection of steel shell concrete void defects. Research on the steel shell concrete void quality detection method for a large immersed tunnel is conducted based on the impact imaging method. First, examining the variation law of nearsource wave field response characteristics, the steel shell concrete void detection technology, including equipment, software, and model, is developed. Second, the evaluation index of steel shell concrete void quality is proposed on this basis. Finally, the effect of the method is validated by a fullscale model test, and the detection result′s accuracy reaches 91%. The result shows that the impact imaging method can accurately describe the void distribution of steel shell concrete and quantitatively evaluate the void conditions, which can provide technical support for the highquality construction and structural optimization of the ShenzhenZhongshan link.

Key words： ShenzhenZhongshan link immersed tunnel; steel shell concrete; nondestructive test; impact imaging method; fullscale model test; void detection

Cite this article

ZHANG Changliang , LI Songhui , ZHANG Yan , PENG Yingjun , LIU Xunnan , BAI Bing .

Application of Impact Imaging Method in Void Detection of a Steel Shell Concrete Interface in ShenzhenZhongshan Link Immersed Tunnel

[J]. Tunnel Construction, 2022 , 42(12) : 2138 -2147 . DOI: 10.3973/j.issn.2096-4498.2022.12.016

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