Creep properties of Saskatchewan potash
Date
1969
Authors
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Journal ISSN
Volume Title
Publisher
ORCID
Type
Degree Level
Masters
Abstract
Creep tests have been performed on sets of
cylindrical model pillars made from potash ore mined in Saskatchewan. The model pillars have been subjected to constant axial stresses of 5000, 6000, and 7000 psi at constant temperatures in the range 80°F to 110°F for a period of time of 1000 hours. These test conditions represent actual mining conditions existing between 3400
and 4500 feet depth in Saskatchewan.
The test results indicate that the pillar
deformation can be separated into two phases, transient and steady-state creep. There were no signs of tertiary creep occurring in any of the model pillars during the tests. Most of the deformation occurs in the transient creep phase, and it is considerably increased by an increase
in either temperature or axial stress. Steady-state creep rate appears to be relatively unaffected by an increase in temperature or axial stress.
For steady-state creep, which commences approximately 200 hours after the start of the tests, the axial natural strain, Ԑ̅ , could be related to the time, t, by a function of the form Ԑ̅=atᵇ, where a and b are constant for any
particular temperature and axial stress.
Description
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Citation
Degree
Master of Science (M.Sc.)
Department
Geological Sciences
Program
Geological Sciences