The application of a Matsuoka-Nakai-Lade-Duncan failure criterion to two porous sandstones

We summarize two suites of recent true triaxial tests in two porous sandstones, Coconino and Bentheim. One suite of tests conducted under constant σ2 and σ3, which revealed the effect of σ2 and σ3 on rock failure. The other suite of tests, performed under constant Lode angle, determined the failure dependencies on mean stress and Lode angle. Building and modifying failure descriptions by Matsuoka-Nakai (MN) and Lade-Duncan (LD), an explicit...