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Creep properties of Saskatchewan potash

Date

1969

Journal Title

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.

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Citation

Degree

Master of Science (M.Sc.)

Department

Geological Sciences

Program

Geological Sciences

Committee

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DOI

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