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 language | English |
|---|---|
| Title of host publication | Proceedings of the 16th Australasian Tunnelling Conference 2017 |
| Subtitle of host publication | Challenging underground space: Bigger, better, more |
| Place of Publication | Barton, ACT |
| Publisher | Engineers Australia |
| Pages | 1-8 |
| Number of pages | 8 |
| ISBN (Electronic) | 9781922107985 |
| Publication status | Published - 30 Oct 2017 |
| Event | 16th Australasian Tunnelling Conference 2017: ATS 2017 - Star City, Sydney, Australia Duration: 30 Oct 2017 → 01 Nov 2017 http://ats2017.com.au/ (Conference website) https://search.informit.org/browsePublication;isbn=9781922107985;res=IELENG (Conference proceedings) |
Conference
| Conference | 16th Australasian Tunnelling Conference 2017 |
|---|---|
| Abbreviated title | Challenging Underground Space: Bigger, Better, More |
| Country/Territory | Australia |
| City | Sydney |
| Period | 30/10/17 → 01/11/17 |
| Other | ATS 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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