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

• Main Authors: Sun Zhongguang, Fan Jinyang, Wu Fei, Chen Jie
• Format: Article
• Language: English
• Published: VINCA Institute of Nuclear Sciences 2019-01-01
• Series: Thermal Science
• Subjects: rock salt; dilatancy-damage; unloading confining pressure; temperature
• Online Access: http://www.doiserbia.nb.rs/img/doi/0354-9836/2019/0354-98361900223C.pdf

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.