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

Understanding the behaviour of existing tunnels subjected to in-service deformations, as a result of the construction of underground works (e.g. new tunnels) in their proximity, is of importance in order to safeguard infrastructure within the urban environment. The associated deformations that take place during tunnelling have to be carefully assessed and their impact on the existing tunnels needs to be considered. A half-scale segmental 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 conducted 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 tests reported are the first to be conducted on a realistic scale model under carefully controlled conditions, and provide valuable insight into the behaviour of a GCI 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 applied deformations, are determined and compared with those predicted 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.

Bending moment, Experiment, Grey cast iron, Tunnel lining, Ultimate capacity
0886-7798
74-84
Afshan, S.
68dcdcac-c2aa-4c09-951c-da4992e72086
Yu, J. B.Y.
25ec22f6-4617-401f-a35c-b061392d579c
Standing, J. R.
bad861ff-8c54-4d3f-a846-4d844b4eb0ab
Vollum, R. L.
2b5cdc2c-0169-4bd3-96e3-0fe198f164b1
Potts, D. M.
55a753c0-7899-40ba-982b-bea2bbae7bf8
Afshan, S.
68dcdcac-c2aa-4c09-951c-da4992e72086
Yu, J. B.Y.
25ec22f6-4617-401f-a35c-b061392d579c
Standing, J. R.
bad861ff-8c54-4d3f-a846-4d844b4eb0ab
Vollum, R. L.
2b5cdc2c-0169-4bd3-96e3-0fe198f164b1
Potts, D. M.
55a753c0-7899-40ba-982b-bea2bbae7bf8

Afshan, S., Yu, J. B.Y., Standing, J. R., Vollum, R. L. and Potts, D. M. (2017) Ultimate capacity of a segmental grey cast iron tunnel lining ring subjected to large deformations. Tunnelling and Underground Space Technology, 64, 74-84. (doi:10.1016/j.tust.2017.01.007).

Record type: Article

Abstract

Understanding the behaviour of existing tunnels subjected to in-service deformations, as a result of the construction of underground works (e.g. new tunnels) in their proximity, is of importance in order to safeguard infrastructure within the urban environment. The associated deformations that take place during tunnelling have to be carefully assessed and their impact on the existing tunnels needs to be considered. A half-scale segmental 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 conducted 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 tests reported are the first to be conducted on a realistic scale model under carefully controlled conditions, and provide valuable insight into the behaviour of a GCI 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 applied deformations, are determined and compared with those predicted 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.

Full text not available from this repository.

More information

Accepted/In Press date: 14 January 2017
e-pub ahead of print date: 31 January 2017
Published date: 1 April 2017
Keywords: Bending moment, Experiment, Grey cast iron, Tunnel lining, Ultimate capacity

Identifiers

Local EPrints ID: 429978
URI: https://eprints.soton.ac.uk/id/eprint/429978
ISSN: 0886-7798
PURE UUID: 399fa442-d395-4b34-b9a8-5ab10ada1ecd

Catalogue record

Date deposited: 09 Apr 2019 16:30
Last modified: 09 Apr 2019 16:30

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