Analysis of cracking in rock salt

Citation
Vg. Silberschmidt et Vv. Silberschmidt, Analysis of cracking in rock salt, ROCK MECH R, 33(1), 2000, pp. 53-70
Citations number
48
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Geological Petroleum & Minig Engineering
Journal title
ROCK MECHANICS AND ROCK ENGINEERING
ISSN journal
0723-2632 → ACNP
Volume
33
Issue
1
Year of publication
2000
Pages
53 - 70
Database
ISI
SICI code
0723-2632(200001/03)33:1<53:AOCIRS>2.0.ZU;2-5
Abstract
The use of underground mines in salt-rock formations for waste repositories makes the precise analysis of isolation properties of rock salt very impor tant. One of the main mechanisms responsible for a degradation of isolation ability of the rock salt is the generation and development of cracks under influence of mining processes. Various aspects of cracking in salt rocks a re studied - both in situ and in laboratory tests - for rocks of the world' s largest Verkhnekamskoe potash-ore deposit (Russia:). It is shown that Mot all the discontinuities (fractures) are closed in the course of the creep deformation of rocks. Parameters of cracking are determined for various con ditions: age of pillars, mining technology, etc. Different methods - filtra tion, electrometric, nuclear magnetic resonance, mechanical tests are used for crack observation and characterisation, both in specimens and in situ. Traditional investigations (partly with specially designed equipment) are a ccomplished by the testing methods of fracture mechanics for determination of critical values of stress intensity factors K-Ic and K-IIc. The problems and ways of the use of the obtained results in analysis of isolation prope rties for areas in vicinity of underground mines and/or waste repositories are discussed.