Given that the confining force boosts, the rise in resistance to longitudinal crack propagation ends in a gradual changeover of shale failure manner from longitudinal to inclined shear failure that displays an escalation in rock plasticity. When the confining pressure reaches 30 MPa, there are still regional shear microcracks https://page93570.blogdomago.com/40197669/wellbore-stability-in-drilling-an-overview