SHEAR SLIDING FAILURE OF THE JOINTED ROOF IN LAMINATED ROCK MASS

Citation
Jq. Ran et al., SHEAR SLIDING FAILURE OF THE JOINTED ROOF IN LAMINATED ROCK MASS, Rock mechanics and rock engineering, 27(4), 1994, pp. 235-251
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Geosciences, Interdisciplinary","Engineering, Civil
ISSN journal
0723-2632
Volume
27
Issue
4
Year of publication
1994
Pages
235 - 251
Database
ISI
SICI code
0723-2632(1994)27:4<235:SSFOTJ>2.0.ZU;2-D
Abstract
The jointed roof in laminated rock mass may be capable of self-support and sustaining transverse load and can be analysed by the voussoir be am notation. There are three main failure modes of a voussoir beam str ucture: crushing in the high stress areas, buckling without localised material failure and shear sliding along the joints. Previous studies on the voussoir beam have concentrated on the crushing failure mode, a ssuming that the voussoir beam would not fail by shear sliding prior t o reaching its crushing strength. However, the possibility exists that the voussoir beam may collapse by shear sliding along the joints with a strength much lower than that predicted by the estimation method fo r crushing failure, depending upon the joint properties. Hence the sta bility analysis of a jointed roof without considering the shear slidin g failure may lead to disastrous consequences. In this paper a numeric al and experimental study has been carried out to analyse the shear sl iding failure of voussoir beams containing vertical and inclined joint s with one or more mid joints. Equations for verification of shear sli ding are proposed and effects of the voussoir beam geometry and materi al properties on the shear sliding failure are also discussed.