The problem of nuclear waste disposal has emphasized the need for research on blast-induced damage around underground excavations. This paper shows how geostatistical methods might be used to delineate zones of damage when the systematic rock testing approach is used. Some basic concepts of the theory of regionalized variables are presented and then illustrated by a typical application. The conclusions drawn from the latter using the theory of regionalized variables are quite different from those drawn from a previously published study based on the same data but using conventional statistical methods. Key words: rock mechanics, regionalized variable, induced damage, geostatistics, dilatometer.
Regu 22 octobre 1975 Accept6 28 juillet 1976 L'envergure des projets de la Communaute urbaine de Montreal qui impliquent le percement de tunnels en rocher laissant presager I'utilisation de foreuses pleine section, les techniques d'investigations qui avaient cours ont CtC adaptees. La description, la discussion et I'illustration de ces nouvelles techniques d'investigations constituent l'objet principal de la communication.Apres avoir fait la revue des problemes lies a la geologie rencontres lorsqu'il est question d'utiliser des foreuses pleine section, les auteurs presentent les diverses investigations qui conduisent B une meilleure connaissance gComCcanique des emplacements; ils decrivent le programme de sondage, prkcisent les points que le compte rendu du forage doit souligner dans les circonstances et prksentent les differents essais effectues.Le programme d'essais en laboratoire comprend des compressions diametrales, uniaxiales et triaxiales ainsi que des poingonnements du type Handewith. En place, le programme comporte des essais au pressio-permeamktre Menard, au verin Goodman ainsi que des essais de poingonnement a I'aide d'un appareil c o n y I'Ecole Polytechnique de Montreal.L'utilisation que les concepteurs peuvent faire des risultats de ces investigations est discutte. La communication est illustree par un cas type.Due to the extent of projects of the Montreal Urban Community involving rock tunnelling, the possibility of using full face boring machine had to be considered. The usual site investigation techniques had to be revised. The main purpose of this paper is to describe, discuss and illustrate the new investigation techniques.Problems related to geology that might be encountered with full face boring machines are reviewed and the various investigations which lead to a better geomechanical knowledge of tunnel sites are presented. The diamond drilling program and the aspects which need to be stressed in the reports are discussed.The laboratory testing program includes splitting tests, uniaxial and triaxial compression tests, and modified Handewith punching tests. 111 sitlr testing program comprises Menard pressiopermeameter tests, Goodman jack tests, and borehole punching tests performed with an apparatus developed at Ecole Polytechnique de Montreal.The use by the designer engineers of the investigation results of such investigations is discussed and typical case is presented.
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