Combination of undrained and drained analysis to design the temporary supports of a large diameter tunnel

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Abstract

The purpose of this paper is to present the analysis and design methodology used for soil-support interaction of a large diameter tunnel in a saturated soil mass. PLAXIS software was used to evaluate the required support for both short and long term. Based on the characteristic curve of the unsupported tunnel, considering installation of the supports before the tunnel face, 50% stress release was considered before support installation. At this stage of analysis, undrained behaviour was considered through analysis, which resulted in the reduction in the pore water pressure around the tunnel due to tunnel converging. Reduction of pore water pressure in the soil mass was balanced with the parameters of the reinforced concrete required for the stability of the tunnel in a short time. The analysis was followed by a fully coupled analysis with drained soil parameters to control and design the support for the long term condition. Based on this analysis, a cost effective solution was made for the temporary support of the tunnel to bear the overburden pressure in both short and long term. Temporary support involves the installation of a 5-segment lattice girder per 75 cm of the tunnel plus 30 cm thickness shotcrete and wire mesh.
Original languageEnglish
Title of host publicationProceedings of the 16th Australasian Tunnelling Conference 2017
Subtitle of host publicationChallenging Underground Space: Bigger, Better, More
Place of PublicationBarton, ACT
PublisherEngineers Australia
Pages1-8
Number of pages8
ISBN (Electronic)9781922107985
Publication statusPublished - 30 Oct 2017
Event16th Australasian Tunnelling Conference 2017: ATS 2017 - Star City, Sydney, Australia
Duration: 30 Oct 201702 Nov 2018
http://ats2017.com.au/ (Conference website)
https://search.informit.org/browsePublication;isbn=9781922107985;res=IELENG (Conference proceedings)

Conference

Conference16th Australasian Tunnelling Conference 2017
Abbreviated titleChallenging Underground Space: Bigger, Better, More
CountryAustralia
CitySydney
Period30/10/1702/11/18
OtherATS 2017 is the Australasian Tunnelling Society’s triennial industry conference. This event is future focussed - investigating the latest scientific and technological innovation; practical applications of these innovations; the future development of tunnelling processes.
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