Effects of bedding angle and specimen geometry on the failure of layered rocks

Experimental investigation on damage and seepage characteristics of layered slate under cyclic loading and unloading of stress

To investigate the damage deterioration and seepage evolution of bedded slate under cyclic axial loading–unloading, triaxial tests were conducted on specimens with bedding angles of 0°, 30°, 45°, 60° and 90° under 10 MPa confining pressure and 5 MPa pore pressure. The study systematically analyzed the influence of bedd...

A JRC3D shear strength model considering failure surface spatial anisotropy of soft rock

Effects of a Weak Interlayer Zone on the Tensile Mechanical Properties and Failure Characteristics of Rock

Brazilian tests on limestone with weak interlayers (thickness 0.1–1.35 mm) were performed using RMT and 3D scanning. Results show that BTS decreases nonlinearly with increasing thickness and exhibits a complex angle dependence: fracture length and roughness first rise then peak at 30°, while microscopic features of r...

Shear response and spatial evolution of roughness degradation in rock fracture surfaces with heterogeneously distributed multi-angle asperities

The simplified characterization of rough rock fracture morphology is fundamental to understanding shear mechanical behavior. This study presents a method for constructing fracture surfaces by integrating profiles with varied inclined dentate asperities. The resulting five surfaces (D_1 to D_5) were quantitatively val...

Anisotropic progressive shear damage and fracture mechanisms of fractured shale based on acoustic-optical-mechanical methods

Bedding planes and natural fractures are key factors controlling the anisotropic mechanical properties of shale reservoirs, exerting a critical influence on underground engineering. However, their shear deformation and fracture evolution mechanisms remain poorly understood. In this study, synthetic shales containing be...

Influence of Anisotropic Texture on Fracture Toughness of Shale Rocks under Cyclic Loading during Drilling

Shale rocks exhibit strong mechanical anisotropy due to their layered texture, which significantly influences fracture behavior under the cyclic loading conditions encountered during drilling. This study investigates the effect of anisotropic texture, characterized by bedding orientation angle β, on the Mode I fractu...