As the confining stress increases, the increase 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. If the confining strain reaches 30 MPa, there remain local shear microcracks round the https://tryhere03332.wikicommunication.com/6234818/top_latest_five_wellbore_stability_urban_news