Experimental Study on Mechanical Properties of Longitudinal Joints in Prefabricated Two-Wall-in-One Diaphragm Walls

HUANG Jiahuan; RAO Wei; QIU Tong; CHEN Xiangsheng; CHEN Wuxiong YANG Li; CHEN Kunyang; HE Qiufeng; ZHENG Zhenji; WU Beiyu; LI Aidong; LU Linhai

doi:10.3973/j.issn.2096-4498.2025.03.011

Tunnel Construction >

2025 , Vol. 45 >Issue 3: 556 - 566

DOI: https://doi.org/10.3973/j.issn.2096-4498.2025.03.011

Experimental Study on Mechanical Properties of Longitudinal Joints in Prefabricated Two-Wall-in-One Diaphragm Walls

HUANG Jiahuan ,
RAO Wei ,
QIU Tong ,
CHEN Xiangsheng ,
CHEN Wuxiong YANG Li ,
CHEN Kunyang ,
HE Qiufeng ,
ZHENG Zhenji ,
WU Beiyu ,
LI Aidong ,
LU Linhai

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(1. State Key Laboratory of Intelligent Geotechnics and Tunnelling (Shenzhen University), Shenzhen 518060, Guangdong, China; 2. Key Laboratory of Coastal Urban Resilient Infrastructure (MOE), Shenzhen University, Shenzhen 518060, Guangdong, China; 3. College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, Guangdong, China; 4. CABR Shenzhen Construction Technology Co., Ltd., Shenzhen 518057, Guangdong, China; 5. China Railway Design Corporation, Tianjin 300142, China; 6. Jinan Rail Transit Group Co., Ltd., Jinan 250101, Shandong, China)

Online published: 2025-03-20

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Abstract

The mechanical properties of longitudinal joints in prefabricated two-wallin-one diaphragm walls are investigated through a case study on a metro station. The study seeks to understand the load transfer mechanism and failure mode of the sinking-inserting joints in these structures and to assess the bearing capacity and ductility of the joints. Furthermore, a full-scale bending test is carried out under simulated on-site assembly conditions. The research results indicate the following: (1) The cracking and separation between the CT-locks and concrete serve as critical indicators of the joints′ plastic behavior and ultimate bearing capacity. The tensile fixation of the CT-locks ensures the ductility of the sinking-inserting joints and contributes to the stability of the longitudinal structure in prefabricated two-wall-in-one diaphragm walls. (2) The sinking-inserting joints exhibit distinct three-stage developmental characteristics, with the moment-rotation relationship curve showing a bilinear pattern. The yield bearing capacity and the ultimate bearing capacity are approximately 215 and 265 kN·m, respectively, with the yield bearing capacity accounting for approximately 80% of the ultimate bearing capacity. The bearing capacity of the joint is approximately 30% of that of the continuous section. (3) Under the influence of CT-locks, the joints behave as hinged joints with ductile properties.

Key words： prefabricated two-wall-in-one diaphragm walls; sinking-inserting joint; CT lock; full-scale bending experiment; longitudinal joints; mechanical properties

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HUANG Jiahuan , RAO Wei , QIU Tong , CHEN Xiangsheng , CHEN Wuxiong YANG Li , CHEN Kunyang , HE Qiufeng , ZHENG Zhenji , WU Beiyu , LI Aidong , LU Linhai .

Experimental Study on Mechanical Properties of Longitudinal Joints in Prefabricated Two-Wall-in-One Diaphragm Walls

[J]. Tunnel Construction, 2025 , 45(3) : 556 -566 . DOI: 10.3973/j.issn.2096-4498.2025.03.011

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