... the borehole deviated at 45° to the direction of the compression. These preliminary and currently qualitative results show that glass blocks serve as a useful test medium for studies of stress concentration and drilling induced fracture creation. Introduction With the increasing exploitation...

... & mining reservoir geomechanics Upstream Oil & Gas numerical analysis array pattern machine learning stability rock mass classification method stress concentration gangway unsupported span data mining numerical model optimal design productivity total stand-up time safety pillar...

... of the face and thus moves the surcharge zone further ahead of the face (preconditioning); and (ii) it influences the mechanical properties of adjacent rocks (softening the rock, reducing its effec- tive elastic modulus, etc Due to these measures the high stress concentrations in coal seams (or accompanying...

... characteristic about rock slope. Natural frequency and deformation mode determined by eigenvector depend on the structure of slope. Especially, natural frequency in higher mode is sensitive to change of slope structure, such as damage by blasting, generations of plastic zone by stress concentration or weathering...

... structural geology rock massif longwall face metals & mining Thickness Coal Basin Reservoir Characterization concentration seam Redistribution conclusion excavation data mining colliery Czech part OKR karvina part tectonic structure pillar rock burst stress concentration...

... mine safety. In general, Rock3DTMprovides near-real-time graphical rep- resentations of (1) relative stress concentrations as they migrate across an underground rock mass, (2) structural discontinuities, such as faults, joints, or shear zones, and (3) geological anoma- lies such as sand channels...

... are reported of a major pillar/panel instability. It was found that the possible low in situ horizontal stress in this pit dominated the roof coal instability, while the heightening of pillars due to roof falls and the stress concentration induced by blast damage near the highwall contributed to the failure...

... ABSTRACT: The safety and performance of underground structures are in part related to stress concentrations induced in the rock surrounding the structure. The stress concentrations are in turn related to the in situ stress state, the rock properties and the excavation geometry, and they can...

... stress anisotropy is sufficient to cause pronounced effects on coal mine roadway stability, as illustrated in Figure 1. metals & mining stress Redistribution horizontal stress stress concentration reservoir geomechanics junction formation stability stress direction Blackwood...

... of the rock mass behavior. The calculations of stress concentration on the fault were carried out for the specific fault on Kola Peninsula. RESUME: La discussion s'est comporte sur I'influence des facteurs de technogenes sur Ie changement du regime deformateur dans Ie massif rocheux. Les evaluations des...

... & Gas Detournay Reservoir Characterization evolution pore pressure Rock Mech reservoir geomechanics variation stress concentration fracture hydraulic fracture interaction undrained limit equation deformation propagation poroelastic effect Pore Pressure Perturbation Coupled thermo...

... Reservoir Characterization Rock Structure reinforcement vault Artificial Intelligence cavern dynamic analysis excavation stress distribution numerical modeling rock mass Rock mechanics powerhouse stress concentration Static and dynamic analysis of rock caverns Statische und dynamis.che...

... elasticity boundary value problem tunnel section coefficient stress concentration geometry boundary stress parabolic floor calculation rotation arched roof tunnel unit circle boundary biaxial in-situ stress field in-situ stress field plane elasticity equation ABSTRACT...

... boreholes in the dam area, disc-shaped cores occurred in 84 of them. In 40 of the 48 boreholes in the river bed zone with high stress concentration, core discing was observed. The disc thickness is 1–3 cm and the major principal stress measured in the borehole is 65 MPa. Besides, when preparing rock...

... methodology for excavation design in massive elastic rock involves determination of elastic stresses occurring at the excavation boundary where they attain their critical values (Brady and Brown, 1985: 185). Then, these critical stress concentrations are compared with the uniaxial tensile and compressive...

...). From the figure, it can be seen that the highest fracture probability appeared at the altitudes between 930–975m. This band is 20–40m just underneath the surface of rock base. According to the results of a series of experiments and analyses, it can be defined that the stress concentration in bottom...

.... Reservoir Characterization Upstream Oil & Gas Vnimi contour Wellbore Design Moscow normal stress reservoir geomechanics ion junction zone metals & mining skochinsky concentration Leningrad dynamic stress concentration underground working great depth cross-section two-dimensional...

...- distribution of field stresses takes place. This causes stress concentration at the sur- face of the opening. Therefore while design- ing an underground structure in rock or e- valuating the stability of an existing struc- ture, one must determine, (i) the stress/or deformation in the structure resulting from...

... of the primary mining. Reservoir Characterization roof rock horizontal stress stress concentration reservoir geomechanics borehole Rock stress ore body overburden stress extraction inclination metals & mining variation primary mining pillar deformation inflation haulage level...

... mining company average vertical stress stress concentration vertical stress stress concentration factor theoretical overburden stress flat-ended borehole doorstopper metals & mining borehole vertical stress ratio virgin state uplift 1-5 Measurements of the Virgin State of Stress...