An Experimental Study on Improvement of a Waterproof
Sealing Gasket Corner Structure for a LargeDiameter
RiverCrossing Shield Tunnel

GUO Zhong; LIN Zhijun; JIANG He; OUYANG Wanlin

doi:10.3973/j.issn.2096-4498.2021.07.012

2021 , Vol. 41 >Issue 7: 1180 - 1187

DOI: https://doi.org/10.3973/j.issn.2096-4498.2021.07.012

An Experimental Study on Improvement of a Waterproof Sealing Gasket Corner Structure for a LargeDiameter RiverCrossing Shield Tunnel

GUO Zhong ,
LIN Zhijun ,
JIANG He ,
OUYANG Wanlin

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(1. PowerChina Huadong Engineering Corporation Ltd., Hangzhou 310000, Zhejiang, China; 2. Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai 201804, China; 3. Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety, Shanghai 201804, China)

Online published: 2021-07-29

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Abstract

Solid is usually adopted for corner structures of shield tunnel waterproof gaskets. In the construction and assembly of a largediameter shield tunnel crossing a river, the corner of the gasket is easily extruded. This can easily lead to a concentration of stress or even fracturing of the concrete in the corner segment. Accordingly, to provide an experimental basis for the optimization of the design of the structure of a waterproof sealing gasket corner, a case study is conducted on a waterproof engineering project that involves the creation of a largediameter shield tunnel within a soft stratum. The project studied is the Xiangjisi Road west extension project in Hangzhou. This project is used to study how different openings in the gasket affect the compression force in the gasket during the process of compression. A total of five sealing gasket corner configurations with different opening lengths and opening radii are designed. Closure compression tests are carried out, and the test results are compared with those for a standard sealing gasket. The experimental results show that, for a scheme consisting of two holes with a radius of 8 mm in the corner of the gasket, the closure compression force for the hole in the center is 76.10 kN/m, which is 38.3% less than for a scheme with no holes. This meets the requirements of the assembly. The contact stress at the corner is found to be 0.89 MPa, which is a reduction of 24% compared with the situation where there is no opening. It is concluded that the closure compression force can be reduced while maintaining a large contact stress.

Key words： largediameter shield; rivercrossing tunnel; waterproof gasket; corner structure

Cite this article

GUO Zhong , LIN Zhijun , JIANG He , OUYANG Wanlin .

An Experimental Study on Improvement of a Waterproof Sealing Gasket Corner Structure for a LargeDiameter RiverCrossing Shield Tunnel

[J]. Tunnel Construction, 2021 , 41(7) : 1180 -1187 . DOI: 10.3973/j.issn.2096-4498.2021.07.012

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