Failure and deformation characteristics of shale subject to true triaxial stress loading and unloading under water retention and seepage.

ABSTRACT: A multi-functional true triaxial fluid-structure coupling system was used to conduct water retention and seepage tests of shale under true triaxial loading and unloading stress paths. The stress-strain evolution of shale specimens under different experimental conditions was obtained, and the corresponding deformation and strength were analysed. The evolution and failure characteristics of cracks in shale were obtained by CT scanning images before and after the experiment. The results show that the volumetric strain of shale specimen increases first, then decreases and finally continues to increase with an increase in deviatoric stress under water retention, indicating that the volumetric change has experienced a compaction-expansion-compacting. The σ-ε ₁ curve of t

SUBMITTER: Li S 

PROVIDER: S-EPMC9326296 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature