DESIGN CONCEPTS AND SUPPORT CONSIDERATIONS FOR HIGHLY STRESSED TUNNELS IN DEEP HARD-ROCK MINES

Authors
SPEARING AJS SPEERS CR FORSYTH MI
Citation
Ajs. Spearing et al., DESIGN CONCEPTS AND SUPPORT CONSIDERATIONS FOR HIGHLY STRESSED TUNNELS IN DEEP HARD-ROCK MINES, Journal of the South African Institute of Mining and Metallurgy, 94(5), 1994, pp. 93-101
Citations number
7
Categorie Soggetti
Metallurgy & Mining
Journal title
Journal of the South African Institute of Mining and Metallurgy → ACNP
ISSN journal
0038223X
Volume
94
Issue
5
Year of publication
1994
Pages
93 - 101
Database
ISI
SICI code
0038-223X(1994)94:5<93:DCASCF>2.0.ZU;2-Y
Abstract
The paper describes how stress analyses were used to show the effect o f a tunnel's shape on the overstressing potential of its periphery. Th e best profile was found to be that of a horizontal ellipse, for which there was little significant scaling, permitting temporary support to be incorporated into a permanent tunnel-support system. This investig ation was followed by the modelling of several support systems for tun nels with a horizontal-ellipse profile, which showed that such a profi le can reduce the installed support required for a tunnel of different cross section by an average of 57 per cent. ,