Report to Inco Mines Research on the influence of unloading on rock strength

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TypeTechnical Report
Series titleContractor Report
Subjectice strength; depressurization; intergranular stress; stress relief cracks
AbstractIce was used as an analog for rock to simulate cracking behaviour during unloading. Columnar grained ice samples were pressurized and then brought to the melting temperature to cause melting at the grain boundaries, thereby removing any intergranular stress. Then, while pressurized, the samples were allowed to refreeze. Then pressure was rapidly removed. No cracks were observed, in contrast to previous experiments on granular ice samples where air was present at grain boundaries. This suggests that air plays an important role in producing cracks. Compressive strength tests performed immediately after depressurization showed no correlation between strength and degrees of stress drop at depressurization.
Publication date
PublisherNational Research Council Canada. Institute for Marine Dynamics
PlaceSt. John's, NL
AffiliationNRC Institute for Ocean Technology; National Research Council Canada
Peer reviewedNo
NRC number5506
NPARC number8895688
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Record identifierce1a480f-545b-45e0-9bfa-6866a06e2e6e
Record created2009-04-22
Record modified2016-10-03
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