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A dilatancy-damage model considering temperature effect for rock salt from unloading path

Investigating the dilatancy of host rock during stress re-distribution is of great significance for underground engineering, especially underground salt cavern storage. To formulate the dilatancy variation, many measurements were conducted via unloading tests with ever-reduced confining pressure and constant axial pressure. The results demonstrated that the initial confining pressure has little influence on the dilatancy of rock salt; the larger axis pressure can promote the dilatancy of rock salt; a higher temperature would accelerate the dilatancy rate and augment the total volumetric expansion. A dilatancy damage model was established by using theoretical deduction and numerical fitting, which showed a good agreement with test data.
PAPER REVISED: 2018-11-19
PAPER ACCEPTED: 2019-02-11
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