RESEARCH ARTICLE


Nonlinear Volumetric Deformation Behavior of Rock Salt Using the Concept of Mobilized Dilatancy Angle



Yan Chen1, 2, Linjian Ma1, 2, *, Pengxian Fan1, 2, Xupu Yang1, Lu Dong1
1 State Key Laboratory of Disaster Prevention & Mitigation of Explosion & Impact, College of National Defense Engineering, PLA University of Science and Technology, Nanjing 210007, China
2 State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221008, China


Article Metrics

CrossRef Citations:
5
Total Statistics:

Full-Text HTML Views: 629
Abstract HTML Views: 322
PDF Downloads: 212
ePub Downloads: 218
Total Views/Downloads: 1381
Unique Statistics:

Full-Text HTML Views: 439
Abstract HTML Views: 258
PDF Downloads: 179
ePub Downloads: 187
Total Views/Downloads: 1063



Creative Commons License
© Chen et al.; Licensee Bentham Open

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution-Non-Commercial 4.0 International Public License (CC BY-NC 4.0) (https://creativecommons.org/licenses/by-nc/4.0/legalcode), which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

* Address correspondence to this author at the State Key Laboratory of Disaster Prevention & Mitigation of Explosion & Impact, College of National Defense Engineering, PLA University of Science and Technology, Nanjing 210007, China; Tel: +86 258 082 5379; E-mail: patton.4400@163.com


Abstract

Post-yield strength and deformation properties of rock salt are of great importance to the stability of rock surrounding deep underground storage caverns. Uniaxial and triaxial compression tests were performed to explore the volume change of Qianjiang rock salt under different confining stress states. The experimental results indicate that the dilatancy angle first increases rapidly then decreases gradually and drives to a constant with equivalent plastic strain. A higher confining stress results in a lower peak dilatancy angle. With the increase of confining pressure, the dilatancy angle decreases nonlinearly. Based on the volumetric-axial strain curves of rock salt, a mobilized dilatancy angle model taking into account the effects of confining pressure and the equivalent plastic strain was developed using nonlinear fitting. The new model was implemented in the software FLAC3D and verified effective to predict the volumetric dilatancy behavior of rock salt.

Keywords: Compression test, Dilatancy angle, Post-yield, Rock salt, Volumetric strain.