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A DILATANCY-DAMAGE MODEL CONSIDERING TEMPERATURE EFFECT FOR ROCK SALT FROM UNLOADING PATH

ABSTRACT
Investigating the dilatancy of host rock during stress re-distribution is of great sig¬nificance for underground engineering, especially underground salt cavern storages. To formulate the dilatancy variation, some measurements were conducted via unloading tests with ever-reduced confining pressure and constant axial pressure. The results demonstrated that the initial confining pressure had little influence on the dilatancy of rock salt. A 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.
KEYWORDS
PAPER SUBMITTED: 2018-08-23
PAPER REVISED: 2018-11-19
PAPER ACCEPTED: 2019-02-11
PUBLISHED ONLINE: 2019-05-26
DOI REFERENCE: https://doi.org/10.2298/TSCI180823223C
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Supplement 3, PAGES [S997 - S1003]
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© 2019 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence