Experimental investigations of bolted segmental grey cast iron lining behaviour

Yu, Jessica; Standing, J. R.; Vollum, Robert L.; Potts, David M.; Burland, J. B.

doi:10.1016/j.tust.2016.10.002

Cited by 25 publications

(21 citation statements)

References 13 publications

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“…Mild steel, grade 4.6, 12 mm diameter bolts were used in this research, as it was not practicable to manufacture wrought iron bolts as used in the LU tunnels. The results of tensile tests on wrought iron bolts recovered from the Waterloo and City Line, carried out at Imperial College, confirmed the suitability of using mild steel bolts in the laboratory investigations for this research (Yu et al, 2017). The upper and middle bolts in the joints at 0°, 60°, 120° and 180° were instrumented appropriately to measure the change in bolt force during the tests.…”

Section: Test Set-up and Instrumentationsupporting

confidence: 55%

“…It was then deformed into elliptical shapes of similar form and magnitude to those observed in existing tunnels. A detailed description of the experimental set-up and the instrumentation employed along with the results of tests at small elastic displacement levels are given by Yu (2014) and Yu et al (2017). This paper reports on the results of the tests on the full ring when it was taken to high strain levels and ultimate failure.…”

Section: Overviewmentioning

confidence: 99%

“…This paper reports on the results of the tests on the full ring when it was taken to high strain levels and ultimate failure. Only a summary of key components of the experimental set-up is provided (details can be sourced in Yu, 2014 andYu et al, 2017). The planning of the tests, the adopted loading procedure and how the bending moment distribution compares with those from prediction methods available are discussed in detail.…”

Section: Overviewmentioning

confidence: 99%

“…The upper and middle bolts in the joints at 0°, 60°, 120° and 180° were instrumented appropriately to measure the change in bolt force during the tests. The first series of tests performed on the ring (Yu et al, 2017), were carefully controlled to avoid exceeding elastic strains, important from the perspectives of changing the properties of the GCI and also strain gauge interpretation. The maximum diametric distortion imposed on the ring was 0.13%.…”

Section: Test Set-up and Instrumentationmentioning

confidence: 99%

“…hoop force) in the ring. The estimated joint bending moment capacities, in the absence of axial compressive force, determined by Yu et al (2017), namely 1.12 kNm for positive bending (akin to straightening the segment) and 0.72 kNm for negative bending (akin to increasing the curvature of the segment) were adopted.…”

Section: Gci Ring Flexural Resistancementioning

confidence: 99%

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Ultimate capacity of a segmental grey cast iron tunnel lining ring subjected to large deformations

Afshan¹,

Yu²,

Standing

et al. 2017

Tunnelling and Underground Space Technology

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Understanding t he behaviour of existing tunnels subjected to in - service deformations, as a result of the construction of underground works (e.g. new tunnel s ) in their proximity, is of importance in order to safeguard infrastructure within the u r ban environment. The associated deformations that t ake place during tunnelling have to be carefully assessed and their impact on the existing tunnels need s to be considered . A half - scale segment al grey cast iron (GCI) tunnel lining ring was tested as part of an extensive research project investigating the impact of new tunnel excavations on existing tunnels conduc ted at Imperial College London. A sophisticated experimental arrangement was developed to deform the ring in a variety of modes under combined displacement and load control. This paper reports on experiments carried out to assess its structural response when subjected to large deformations . The test s reported are the first to be conducted on a realistic scale model under carefully controlled conditions, and provide valuable insight into the behavio ur of a G C I segmental ring during distortions commonly observed in reality . Details of the experiments , including the adopted test set - up and the instrumentation employed , are presented. The measured bending moments around the ring, as a result of the appl ied deformations, are determined and compared with th os e predict ed using the well - known equations given by Morgan (1961) and Muir Wood (1975) , often used in industry , as well as those obtained assuming an elastic continuous ring

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Section: Test Set-up and Instrumentationsupporting

confidence: 55%

Section: Overviewmentioning

confidence: 99%

Section: Overviewmentioning

confidence: 99%

Section: Test Set-up and Instrumentationmentioning

confidence: 99%

Section: Gci Ring Flexural Resistancementioning

confidence: 99%

See 3 more Smart Citations

Ultimate capacity of a segmental grey cast iron tunnel lining ring subjected to large deformations

Afshan¹,

Yu²,

Standing

et al. 2017

Tunnelling and Underground Space Technology

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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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A novel testing setup for determining the flexural properties of tunnel segmental joints: Development and application

Zhang

Liu

Zhuang

et al. 2019

Archives of Civil and Mechanical Engineering

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Experimental investigations of bolted segmental grey cast iron lining behaviour

Cited by 25 publications

References 13 publications

Ultimate capacity of a segmental grey cast iron tunnel lining ring subjected to large deformations

Ultimate capacity of a segmental grey cast iron tunnel lining ring subjected to large deformations

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

A novel testing setup for determining the flexural properties of tunnel segmental joints: Development and application

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