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

作　　者：Dongmei ZHANG Sirui CHEN Zhongkai HUANG Zhaoyuan ZHANG Long SU 

机构地区：[1]Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China [2]Department of Geotechnical Engineering,College of Civil Engineering,Tongji University,Shanghai 200092,China [3]Chine Railway 14th Bureau Group Mega Shield Construction Engineering Corporation Limited,Jinan 250014,China

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2024年第12期991-1005,共15页浙江大学学报(英文版)A辑(应用物理与工程)

基　　金：supported by the National Key Research and Development Program of China(No.2022YFC3800905);the National Natural Science Foundation of China(Nos.52238010,52090082,and 52108381);the Shanghai Science and Technology Committee Program(Nos.22XD1430200,23DZ1202806,and 21DZ1200601);the Young Elite Scientists Sponsorship Program by the China Association for Science and Technology(No.2023QNRC001);the Fundamental Research Funds for the Central Universities,China.

摘　　要：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 loads 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 loading-unloading-reloading 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 loading-unloading-reloading 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.

关 键 词：Segmental tunnel Waterproofing performance Full-scale experiment Longitudinal joint 

分 类 号：O15[理学—数学]