JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE A

Accepted manuscript available online (unedited version)

Waterproofing performance of longitudinal segmental tunnel joints under external loads: a full-scale experimental investigation

Author(s): Dongmei ZHANG, Sirui CHEN, Zhongkai HUANG, Zhaoyuan ZHANG, Long SU
Affiliation(s): Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; more
Corresponding email(s): dmzhang@tongji.edu.cn, 5huangzhongkai@tongji.edu.cn
Key Words: Segmental tunnel; Waterproofing performance; Full-scale experiment; Longitudinal joint

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Dongmei ZHANG, Sirui CHEN, Zhongkai HUANG, Zhaoyuan ZHANG, Long SU. Waterproofing performance of longitudinal segmental tunnel joints under external loads: a full-scale experimental investigation[J]. Journal of Zhejiang University Science A,in press.Frontiers of Information Technology & Electronic Engineering,in press.https://doi.org/10.1631/jzus.A2400354

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author="Dongmei ZHANG, Sirui CHEN, Zhongkai HUANG, Zhaoyuan ZHANG, Long SU",
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year="in press",
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doi="https://doi.org/10.1631/jzus.A2400354"
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%A Dongmei ZHANG
%A Sirui CHEN
%A Zhongkai HUANG
%A Zhaoyuan ZHANG
%A Long SU
%J Journal of Zhejiang University SCIENCE A
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doi="https://doi.org/10.1631/jzus.A2400354"

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T1 - Waterproofing performance of longitudinal segmental tunnel joints under external loads: a full-scale experimental investigation
A1 - Dongmei ZHANG
A1 - Sirui CHEN
A1 - Zhongkai HUANG
A1 - Zhaoyuan ZHANG
A1 - Long SU
J0 - Journal of Zhejiang University Science A
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PB - Zhejiang University Press & Springer
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doi="https://doi.org/10.1631/jzus.A2400354"

Abstract
Chinese Summary
Academic Network
Reviewer Comment

Abstract: When subjected to external loads from the ground and nearby construction, tunnel segmental lining joints are prone to damaging deformation. This can result in water leakage into tunnels, posing great safety risks. With this issue in mind, we conducted a series of full-scale tests to study the effects of external loading on the waterproofing performance of longitudinal joints. A customized rig for testing segmental joints was developed to assess the effect of loading magnitude, eccentricity, and load-unload-reload cycles on waterproofing performance. Additionally, the relationship between joint force, sealing gasket deformation, and waterproofing pressure was investigated. The results indicate that: (1) the sealing gasket’s compression rapidly decreases as external loads increase, which weakens the waterproofing capacity of the joint; (2) the watertightness limit dramatically decreases as the bending moment increases; (3) a load-unload-reload cycle leads to degradation of the joint's waterproofing performance. The findings of this study provide a reference for subsequent waterproofing design of segmental tunnel joints, helping ensure the safety of tunnels throughout their operational lifespans.

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