Experimental investigation on waterproofing performance of segmental joint with double gaskets for shield tunnel  

作　　者：Wenqi Ding Qiushi Wang Yafei Qiao Yuelang Jin 

机构地区：[1]Department of Geotechnical Engineering,College of Civil Engineering,Tongji University,200092 Shanghai,China [2]Key Laboratory of Geotechnical and Underground Engineering,Ministry of Education,200092 Shanghai,China [3]Housing and Urban Development Bureau,Xiacheng District 310000,Hangzhou,China

出　　处：《Underground Space》2022年第5期898-910,共13页地下空间（英文）

基　　金：financially supported by National Natural Science Foundation of China(52090083);Shanghai Committee of Science and Technology(20DZ1202600);China Railway Southern Investment Group Co.Ltd(Project No.ZTNF-2020-1).

摘　　要：The waterproofing capacity of segmental joints is an essential indicator for the long-term service performance of shield tunnels.The segmental joints with double gaskets have been adopted to improve the waterproof performance for certain tunnels with high water pressure,especially water-conveyance tunnels.This paper presents a series of waterproofing tests on joints with different settings of double gaskets via an improved test apparatus.Four cases are investigated,including(i)double gaskets with equal high/low waterproof capacity,(ii)the outer gasket with higher waterproof capacity,and(iii)the outer gasket with lower waterproof capacity.Different joint openings are also considered.Moreover,the water pressures at two cavities are continuously monitored to highlight the waterproofing mechanism and failure pattern of double gaskets.The results demonstrate that the gasket with the higher waterproofing capacity dominates the overall waterproofing capacity of joint with double gaskets;only a little enhancement of the waterproofing capacity is found for the joint with the same double gaskets.The waterproofing capacity of joints with double gaskets decreases with the increase of the joint opening.The failure pattern depends on the arrangement of double gaskets,and four stages can be identified during the whole failure process.The advantages of double gaskets in case of joint rotation are also discussed.

关 键 词：Shield tunnel Waterproofing performance Segmental joint Double gaskets Experiment Failure pattern 

分 类 号：O15[理学—数学]