Because the confining strain will increase, the rise in resistance to longitudinal crack propagation leads to a gradual transition of shale failure manner from longitudinal to inclined shear failure that reflects an escalation in rock plasticity. When the confining strain reaches thirty MPa, there are still community shear microcracks https://elliottdawsm.ssnblog.com/40312821/the-smart-trick-of-wellbore-stability-issues-that-no-one-is-discussing