Su, Jiang and Bloodworth, Alan G. (2016) Interface parameters of composite sprayed concrete linings in soft ground with spray-applied waterproofing. Tunnelling and Underground Space Technology, 59 . pp. 170-182. doi:10.1016/j.tust.2016.07.006

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Abstract

The presence of a spray-applied waterproofing membrane between the primary and secondary lining layers is important to the behaviour of a composite sprayed concrete lined (SCL) tunnel in soft ground. In order to confirm the feasibility of the composite shell lining concept, the structural adequacy of the concrete-membrane interfaces under the effects experienced in a typical tunnel needs to be investigated.
This paper presents a series of laboratory tests on samples cut from composite sprayed concrete panels, to which uniaxial compression, direct tension and direct shear loadings are applied over both short and long-term timeframes under conditions of ambient atmospheric humidity. Test results show that the interfaces are capable of resisting significant compression, tension and shear in both short- and long-term. Failures under these actions should not occur in a typical shallow SCL tunnel, and a degree of composite action between primary and secondary layers should be expected. Influence of substrate
roughness and membrane thickness on the measured interface properties has been quantified. Overall,
this investigation confirms the existence of composite action for composite sprayed concrete linings in
soft ground, and provides parameters based on test results for further research and design.

Item Type:	Journal Article
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Science, Engineering and Medicine > Engineering > Engineering
Library of Congress Subject Headings (LCSH):	Shotcrete, Waterproofing, Surface roughness
Journal or Publication Title:	Tunnelling and Underground Space Technology
Publisher:	Elsevier
ISSN:	0886-7798
Official Date:	October 2016
Dates:	Date Event October 2016 Published 18 July 2016 Available 10 July 2016 Accepted 20 July 2015 Submitted
Volume:	59
Number of Pages:	13
Page Range:	pp. 170-182
DOI:	10.1016/j.tust.2016.07.006
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Copyright Holders:	Elsevier Ltd
Funder:	Mott MacDonald International Ltd.
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