2 CASE-HISTORIES OF TUNNELS THROUGH SQUEEZING ROCKS

Authors
Citation
M. Panet, 2 CASE-HISTORIES OF TUNNELS THROUGH SQUEEZING ROCKS, Rock mechanics and rock engineering, 29(3), 1996, pp. 155-164
Citations number
5
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Geosciences, Interdisciplinary","Engineering, Civil
ISSN journal
0723-2632
Volume
29
Issue
3
Year of publication
1996
Pages
155 - 164
Database
ISI
SICI code
0723-2632(1996)29:3<155:2COTTS>2.0.ZU;2-O
Abstract
The expression ''squeezing rock'' is a concept too vague to be used by practicing engineers. In this paper, it is assumed to mean large conv ergences of the tunnel walls. Two case histories are briefly presented . The Frejus tunnel was driven with a large overburden; on the contrar y, the Sidi Mezghiche tunnel was shallow. Different techniques were us ed to control the convergences. In both cases, the tunnels were locate d in ''complex formations''; the complexity stems from the heterogenei ty and anisotropy of the rock masses, and no efficient technique is av ailable to determine the geotechnical characteristics and the natural state of stress in the formations.