Sealant behavior of gasketed segmental tunnel lining – Conceptual model

Shalabi, Faisal I.; Cording, Edward J.; Paul, S L

doi:10.1002/geot.201500030

Cited by 33 publications

(15 citation statements)

References 5 publications

(2 reference statements)

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“…In contrast to the extensive investigations on the structural behavior of tunnel joints, there are limited number of publications available for their sealant behavior of gasketed tunnel joints. Generally, research efforts have been conducted in forms of constitutive modeling, experimental studies, conceptual interpretations, and numerical simulations . The current approach to determine the waterproof capacity of gasketed tunnel joints is to conduct labortatory tests with respect to one or a set of gasket profiles.…”

Section: Introductionmentioning

confidence: 99%

A computational framework to predict the water‐leakage pressure of segmental joints in underwater shield tunnels using an advanced finite element method

Gong

Ding

2018

Num Anal Meth Geomechanics

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Summary The construction of shield tunnels under riverbeds and seabeds has considerably increased over the past decades. Due to the ultra‐high water head, water leakage through tunnel joints is a major concern during a tunnel's service life. One practical solution to prevent groundwater penetration is to implement ethylene‐propylene‐diene‐monomer gaskets at the segmental joints. However, numerical simulation of fluid pressure penetration into rubber materials remains a challenging problem in computational mechanics. Severe mesh distortions can occur due to large deformation. Consequently, a convergent solution is difficult to achieve. This paper presents an Abaqus‐based numerical framework to solve the previously mentioned problem using the implicit finite element solver. The key aspects of this framework are twofold: (1) a remesh and re‐map algorithm to overcome the excessive mesh distortion, and (2) simulation of fluid penetration into the contact interface of the gaskets to reproduce the water‐leakage process at the tunnel joints. The proposed framework is first tested to simulate the gasket‐in‐groove mechanical behavior and is then validated using experimental data and the solution produced by an explicit finite element solver. The developed framework is then adopted to predict the water‐leakage pressure at gasketed tunnel joints to illustrate the practical applications. Finally, the numerical results are compared with experimental data to demonstrate the accuracy and robustness of the proposed method and confirm its superiority and effectiveness over existing methods. This novel method can be used by tunnel designers to analyze and estimate the waterproof behavior of gasketed joints in shield tunnels without performing extensive experimental testing works.

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Section: Introductionmentioning

confidence: 99%

A computational framework to predict the water‐leakage pressure of segmental joints in underwater shield tunnels using an advanced finite element method

Gong

Ding

2018

Num Anal Meth Geomechanics

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“…And several laboratory tests have been carried out by researchers. Shalabi once conducted experiments to study the leakage behavior and stiffness of segment joints subjected to static ground loads and earthquake shaking . Lu et al conducted an experimental study to investigate the load‐carrying capacity of the full segmental lining having outer diameter of 15.0 m .…”

Section: Introductionmentioning

confidence: 99%

“…Shalabi once conducted experiments to study the leakage behavior and stiffness of segment joints subjected to static ground loads and earthquake shaking. 15 Lu et al conducted an experimental study to investigate the load-carrying capacity of the full segmental lining having outer diameter of 15.0 m. 16 Putke et al carried out several experiments to compare the loading carrying capacity between different forms of shear components and study an optimized shear load transfer in the joints. 17 Recently, Li et al performed tests to obtain the full mechanical behavior of longitudinal joints.…”

mentioning

confidence: 99%

Ultimate load‐carrying capacity of the longitudinal joints in segmental tunnel linings

Liu

Zhang

et al. 2017

Structural Concrete

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According to the service conditions of operating metro shield tunnels, segment joints are vulnerable locations in tunnel linings. In addition, the mechanical performance of segment joints directly determines the bearing capacity of segmental tunnel linings. Illustrated with the typical segment joints of the Shanghai Metro rapid transit system, experiments are conducted to investigate the ultimate bearing capacity of the longitudinal joints under different load conditions. The failure mechanisms of segment joints are introduced. The corresponding analytic model is developed to calculate the bearing capacity of the longitudinal joints during the whole loading process. After verification, the proposed model is further employed to compare the mechanical behavior with full section models. It is found that the failure mode of positive bending moment joints is similar to that of a large eccentricity stress cross section, while the failure mode of positive bending moment joints is similar to that of a small eccentricity stress cross section. What's more, the caulking structure is found to be able to offer the safety margin of structures, which could contribute to the protection of operated subway tunnels.

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“…Jointed segmental precast concrete linings connected by steel bolts are commonly used in most shield driven tunnels. Due to the existence of joints, the joint openings will have important influence on tunnel leakage [1]. According to preliminary investigation of Shanghai Metro Tunnel, substantial proportion of shield tunnel sections features water leakage in different degrees.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Leakage Paths Induced by Longitudinal Differential Settlement of the Shield-driven Tunneling

Liu¹,

Zhou²

2017

dtetr

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It is a clear simplification to consider the tunnel lining as uniformly permeable. In reality, it is more likely that there are specific leaks, associated with segmental lining joints. In the case of the in situ concrete linings, construction joints can provide leakage paths, especially accounting for most of the water leakage. For transportation tunnels in saturated soils below water table, different settlements will lead to ring offsets and changes in joint opening near the edges where the gaskets are located and may significantly affect the sealant potential of the lining. In this paper, taking the metro line No.1 in Shanghai as an example, the development of joint opening and ring offset was set up based on the mechanical model of segment joint. Based on the magnitude of the joint opening or ring offset, the occurring of water leaking into the tunnel through the joint system can be judged. This analysis not only helps us realize the leakage paths of the segmental linings, but also provides the guidance for waterproof design and protection measures of the shield tunnel.

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Sealant behavior of gasketed segmental tunnel lining – Conceptual model

Cited by 33 publications

References 5 publications

A computational framework to predict the water‐leakage pressure of segmental joints in underwater shield tunnels using an advanced finite element method

A computational framework to predict the water‐leakage pressure of segmental joints in underwater shield tunnels using an advanced finite element method

Ultimate load‐carrying capacity of the longitudinal joints in segmental tunnel linings

Analysis of Leakage Paths Induced by Longitudinal Differential Settlement of the Shield-driven Tunneling

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