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Updated Drucker-Prager Constants for Anhydrite and Polyhalite

Morgan, H.S.; Krieg, R.D.

The Waste Isolation Pilot (WIPP) reference stratigraphy contains layers of both anhydrite and polyhalite which mush be included in models used to compute the response of WIPP rooms and drifts. These layers have usually been modeled as elastic materials due to the ease in implementing elastic models.