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Numerical analysis and capacity evaluation of composite sprayed concrete lined tunnels

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Bloodworth, Alan G. and Su, Jiang (2018) Numerical analysis and capacity evaluation of composite sprayed concrete lined tunnels. Underground Space, 3 (2). pp. 87-108. doi:10.1016/j.undsp.2017.12.001

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Official URL: https://doi.org/10.1016/j.undsp.2017.12.001

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Abstract

Spray-applied membranes for waterproofing of sprayed concrete tunnels have led to the possibility of shear transfer between primary and secondary linings through the membrane interface, with potential for reducing overall lining thickness. Laboratory tests have shown a reasonable degree of composite action in beam specimens. In this paper, a numerical model previously calibrated against such tests is applied to a whole tunnel, considering soil-structure interaction and staged lining construction. The model shows composite action and load sharing between the lining layers is expected in the tunnel as in the beams. Parametric studies over the practical range of interface stiffnesses show that composite action is maintained, although at high interface stiffness too much bending may be attracted to the secondary lining, requiring additional reinforcement. An efficient composite shell design with minimal additional reinforcement is achievable if the secondary lining thickness is reduced from current practice. Robustness of the system measured in terms of the interface’s ability to transfer stress under unequal loading, causing distortion on the tunnel, is found to be generally adequate. However, adjacent construction in close proximity may give insufficient margin on membrane tensile debonding, especially if membrane conditions are partially or fully saturated.

Item Type: Journal Article
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Science > Engineering
Library of Congress Subject Headings (LCSH): Shotcrete-lined tunnels -- Design and construction, Waterproofing
Journal or Publication Title: Underground Space
Publisher: Elsevier B.V.
ISSN: 2467-9674
Official Date: June 2018
Dates:
DateEvent
June 2018Published
27 December 2017Available
6 December 2017Accepted
Volume: 3
Number: 2
Page Range: pp. 87-108
DOI: 10.1016/j.undsp.2017.12.001
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDMott MacDonald International Ltd.https://viaf.org/viaf/125246017

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