... criteria, it is observed that the strength of rock decreased from 0° to 30° and the rock strength is continuously increased from 30° to 90°. Simulation of failure patterns in tested specimens are matched to anisotropy planes from 0° to 30°. As per above conclusion the natural foliation (anisotropic...

... geological subdiscipline orientation hydrostatic loading development waveform borehole atmospheric science workflow geological engineering earth fracture geologist reservoir geomechanics fiber optic sensor anisotropy university modulus information british columbia 15th ISRM Congress 2023...

... ABSTRACT: A constitutive model considering the natural and induced anisotropies in the short- and long-term behaviour is proposed by combining the elasto-visco-plasticity for rock matrix and weakness planes. The main assumption is that the failure of claystone material is due to the failure...

... boundary technology roorkee anisotropy figure 2 rock mechanic figure 4 correlation boundary displacement 15th ISRM Congress 2023 & 72nd Geomechanics Colloquium. Schubert & Kluckner (eds.) © ÖGG Effect of scale and in-situ stress ratio on the deformation modulus of rock mass around tunnels Srujan...

..., the angular distance between two joint sets was approximately 30°, and the angle of anisotropy was within 15° of the slope face. INTRODUCTION When multiple structure sets influence anisotropic rock mass behaviour instead of a single plane of weakness, accounting for the combined reduction in rock mass...

... (surface heterogeneity), and the direction of measurement (surface anisotropy). Therefore, the scale effect, heterogeneity and anisotropy should be quantitatively assessed to understand their role in shear resistance variations. This paper describes the surveys carried out on an extensive natural...

...-bearing features. Key aspects to address were connectivity, anisotropy, and heterogeneity. upstream oil & gas europe government rock type hydrogeology igneous rock geologist hydraulic fracturing borehole sweden government environmental geology reservoir characterization...

... attention is given to the configuration of the fractured zone and its dependence on the orientation of the tunnel. Using this analysis as reference, the effects of stiffness and strength anisotropy as well as of the in-situ stress anisotropy are examined. The analyses reveal that either strength anisotropy...

...’ theory. Of note, the novel grain-based model allowed the direct determination of macroscale anisotropy in elastic and strength properties without the need for trial-and-error calibrations of input parameters. In addition, the proposed breakable grain scheme provided for realistic representations...

... ABSTRACT: This study analyzes the propagation of fractures around a gallery submitted to fluid injection. After recalling some concepts of fracture modeling in a porous medium, 2D simulations are carried out with the finite element code Disroc ® . These simulations account for the anisotropy...

...° and 45°, mixed mode fracture as β =60° and 75°, respectively. INTRODUCTION In recent years, development of shale gas has been booming in Sichuan Basin of China, where the major target play is the Longmaxi shale (Zou et al. 2021). As a typical sedimentary rock, Longmaxi shale shows anisotropy...

... and for considerable distance away from the injection hole. sedimentary rock dip-slip fault clastic rock structural geology rock type mudstone mudrock reservoir geomechanics upstream oil & gas complex reservoir shale gas geologist fracture hydraulic fracturing cube propagation anisotropy...

... anisotropy plane. This behavior can be theoretically defined by five independent elastic parameters, namely two Young's moduli ( E and E’ ), two Poisson's ratio ( ν and ν ’) and a shear modulus ( G ). Analytical methods based on Lekhnistskii's (1963) elasticity analyses can be used to obtain...

... ABSTRACT: This paper proposes the size-dependent and anisotropic Coulomb failure criterion to describe the size effect and anisotropy of shale strength. The failure criterion assumes that cracks and bedding planes cause size effect and anisotropy. The failure criterion has six parameters...

... ABSTRACT: Rock strength anisotropy and heterogeneity are two key properties of various types of rocks. Discontinuities are the most significant factor on the anisotropic and heterogeneous behavior of rock mass strength. In this study, Universal Discontinuity index (UDi) applied to spatial...

... method. Simulation was conducted on 3 constant velocity inlets. From the results, flow behavior in 4 fracture pairs all show anisotropy in opposite directions. Different flow behaviors of the walls swapped fracture pairs indicate the influence of normal vectors of fracture asperities. Ratios...

... ABSTRACT: This study aims at analyzing the fracture initiation pressure (FIP) of horizontal wellbore in anisotropic shale by considering elastic and strength anisotropy. The FIP is deduced as a function of the anisotropic elastic properties, in-situ stresses, anisotropic tensile strength...

... ABSTRACT: As an unconventional energy, shale gas is being developed widely. As one of the core means of development for shale gas, hydraulic fracturing is greatly affected by the mechanical properties of shale, especially its anisotropy and shear characteristics related to the activation...

.... Fractures provide high permeability pathways for fluid flow and leakage for shales because of their low permeability. Shales have a layered structure with discontinuities parallel to the bedding plane, which can result in distinct anisotropy in their hydro-mechanical behavior. This paper aims to understand...

... ABSTRACT: Failure mechanisms in open pit mining applications often involve a combination of weak rock mass and adverse structure. Major structure is typically included explicitly with less persistent fabric included using general anisotropy or ubiquitous joint constitutive models in both...