|Table of Contents|

Waterproofing performance of flat-bottomed gaskets for segment joint of shield tunnels with quick connectors(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年4期
Page:
53-67
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Waterproofing performance of flat-bottomed gaskets for segment joint of shield tunnels with quick connectors
Author(s):
DING Wen-qi1; 2;  LI Rui-jia1; 2;  QIAO Ya-fei1; 2;  WU Yu-dong1; 2;  YU Yong3;  HUANG Ji-hui4
(1. College of Civil Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3. China Railway Liuyuan Group Co., Ltd., Tianjin 300308, China; 4. School of Rail Transit, Fujian Chuanzheng Communications College, Fuzhou 350007, Fujian, China)
Keywords:
shield tunnel;  quick connector;  ethylene propylene diene monomer;  flat-bottomed gasket;  waterproofing performance of segment joint;  thermal oxidative aging;  long-term performance prediction
PACS:
U454
DOI:
10.19721/j.cnki.1671-8879.2025.04.005
Abstract:
To investigate the waterproofing performance of a new type of flat-bottomed ethylene propylene diene monomer(EPDM)gasket, numerical simulations were conducted, compression tests were performed with a universal testing machine, concrete segment test blocks were fabricated for full-scale waterproofing tests, and compressed thermal-oxidative aging tests were designed and carried out under different joint openings. Additionally, the long-term waterproofing performance of the gaskets was predicted using the Arrhenius equation. The research results indicate that when the joint offset is 0, 3 and 5 mm, the closure pressure required for assembling the gasket is 24.85, 21.87, and 24.59 kN/m, respectively. The flat-bottomed design effectively reduces the assembly force required for gasket closure. The similarity in the closure pressure under different offset conditions indicates that the removal of the column base structure reduces the impact of joint offset on the compression performance of gasket. Under the most unfavorable condition of 3 mm joint opening and 5 mm offset, the flat-bottomed gasket achieves a waterproofing capacity of 0.8 MPa, meeting the short-term design waterproofing requirement of 0.7 MPa. The ultimate waterproofing capacity obtained from the test using concrete specimens is lower than that using steel specimens. The rough concrete surface reduces the waterproofing performance and may become a potential weak point for waterproofing. After considering the gasket bottom surface into in the seepage path, the maximum waterproofing pressures obtained through the simulation closely match the test results, with most deviations within 80 kPa,verifying the reliability of the numerical simulation method. Unlike traditional gaskets with column base structures, the removal of the column base eliminates stress concentration at the bottom surface, potentially resulting in lower waterproofing performance at the bottom than the top. Under the joint openings of 0 and 3 mm, the aging coefficients of flat-bottomed gaskets at room temperature are 0.45 and 0.72, respectively, indicating better aging resistance compared to traditional gaskets and cylindrical specimens. The higher the compression force applied to the gasket, the faster the performance of gaskets degradation, and the more sensitive it becomes to temperature change.3 tabs, 15 figs, 32 refs.

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Last Update: 2025-07-25