Analysis of Cracking in Rock Salt |
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| Authors: | V G Silberschmidt V V Silberschmidt |
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| Institution: | (1) CSEE, Perm, Russia, RU;(2) Braunschweig, Federal Republic of Germany, DE;(3) Department A for Mechanics, Technical University of Munich, Garching b. München, Federal Republic of Germany, DE |
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| Abstract: | Summary ?The use of underground mines in salt-rock formations for waste repositories makes the precise analysis of isolation properties
of rock salt very important. 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
are studied – both in situ and in laboratory tests – for rocks of the world's largest Verkhnekamskoe potash-ore deposit (Russia). It is shown that not
all the discontinuities (fractures) are closed in the course of the creep deformation of rocks. Parameters of cracking are
determined for various conditions: age of pillars, mining technology, etc. Different methods – filtration, 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 accomplished 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 properties for areas in vicinity of underground
mines and/or waste repositories are discussed. |
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