Under complex geostress caused by long-term geological evolution, approximately parallel
bedding structures are normally created in rocks due to sedimentation or metamorphism …

The textural characteristics of rocks influence their petrophysical and mechanical properties.
Such parameters largely control rock mass stability. The ability to evaluate both immediate …

The failure mechanism and failure mode of anisotropic rock masses are very different from
those of isotropic rock masses. For unsupported tunnels, the failure modes of anisotropic …

The effect of bedding plane orientations on shear strength and failure mechanisms of shale
is investigated, with an emphasis on the shear parameters of the bedding planes. This study …

More often than not, it is difficult or even impossible to obtain directly the specific rock
parameters of interest using in situ methods. The procedures for measuring most rock …

The Hoek–Brown criterion parameters (σci, mi and s) are significantly influenced by the
strength anisotropy of intact rock. In the present study, the criterion was modified by …

Shale formations, due to the presence of laminations and weak planes, exhibit directional
strength characteristics. In most conventional wellbore stability analyses, rock formations are …

The strength of rocks in the subsurface is critically important across the geosciences, with
implications for fluid flow, mineralisation, seismicity, and the deep biosphere. Most studies of …

Lower Paleozoic shale is an important hydrocarbon source rock and natural gas reservoir in
the Upper Yangtze Plate. In this study, compressive strength+ acoustic emission (AE), low …

We explore microstructure-related effects of loading direction and specimen size on the
anisotropy of uniaxial compressive strength in coal. We measure uniaxial compressive …