VACUUM TESTING OF THE PERMEABILITY OF THE EXCAVATION DAMAGED ZONE

Citation
At. Jakubick et T. Franz, VACUUM TESTING OF THE PERMEABILITY OF THE EXCAVATION DAMAGED ZONE, Rock mechanics and rock engineering, 26(2), 1993, pp. 165-182
Citations number
12
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Geosciences, Interdisciplinary","Engineering, Civil
ISSN journal
0723-2632
Volume
26
Issue
2
Year of publication
1993
Pages
165 - 182
Database
ISI
SICI code
0723-2632(1993)26:2<165:VTOTPO>2.0.ZU;2-7
Abstract
The vacuum permeability method provides a new approach to assessment o f permeability in the near-field of rock excavations. The method, whic h resembles leak testing of vacuum lines, is based on the measurement and interpretation of the pneumatic response to evacuation of a rock m ass. As the induced drainage area is in order of meters, the method is particularly suitable on the scale of the excavation damaged zone. Th e data can be evaluated either analytically or numerically. The evalua tion is similar to the approach used in the analysis of drill stem tes ts in gas wells. Experiments on large scale laboratory models corrobor ated the validity of the method and the evaluation procedure. Field te sts were conducted at a wide range of geomechanical conditions. The co llected data indicate that there are three characteristic types of per meability distribution in the excavation damaged zone.