... angles (55 , 35 , 20 , and 10 measured from the horizontal axis, undergo larger deformations compared to that of the samples with bedding layers oriented in higher angles (83 ) at any stage of loading. When 75% of the peak load is reached, a considerable deformation had taken place in samples...

... leading to dilution of precious ore. Current practice of designing backfill includes only gravity loading (static) on backfill. In reality, backfill is loaded by static and dynamic loads during extraction of adjacent pillars. The static load is due to weight of the backfill and dynamic loading is due...

... Abstract Acoustic emission characteristics and law of halite and thenardite under uniaxial cyclic loading and unloading are studied by using TYJ 600 rock mechanics testing system controlled by the microcomputer, electro-hydraulic servo control and SDAES digital acoustic emission instrument...

... hydrostatic and shear loading; (2) follows the associated flow rule for viscoplastic deformation; (3) adopts a creep modulus that varies with stress ratios; and (4) considers the primary and secondary creep behaviors of rock. This model requires 13 material parameters, comprising 3 for elasticity, 7...

.... Failure of brittle hard rocks is a gradual process, which involves microcrack initiation, propagation, and coalescence. Because of the randomness of joints and fractures of the rocks, a failure may be occur from the propagation of the initial cracks and faults under external loading, and the traditional...

... storage while one cycle every day for compressed air energy storage. For investigation of mechanical characteristics of rock salt under injection and withdrawal cycles, triaxial cyclic loading tests were conducted using a MTS test system. Linear relationships between stress and strain under unloading...

..., using a servo–controlled compression device with a constant rate of displacement. Four transducers were used for monitoring the acoustic emissions during loading. Acoustic emission event-hit data were recorded continuously until the failure of the specimens. Axial and radial deformations have also been...

... variation Deformational Characteristic shear stress volumetric strain dilation loading constitutive model Upstream Oil & Gas sandstone moduli deformation behavior hydrostatic stress Reservoir Characterization anisotropic degradation weak sandstone volumetric deformation...

... in the crack plane. Any combination of the three basic modes is referred to as mixed mode. The principle of superposition is sufficient to describe the most general case of crack tip deformation (Whittaker et al. 1992). Any loading of a fracture will result in an alteration of the stresses at the fracture tip...

... wellbore integrity cyclic loading reservoir geomechanics strength rock salt surface subsidence Reservoir Characterization Upstream Oil & Gas strain-time curve Wellbore Design cavern specimen MPa loading GPa storage cavern cavern closure creep test viscoplasticity cyclic...

...ISRM-Sponsored International Symposium on Rock Mechanics: Rock Characterisation, Modelling and Engineering Design Methods 1 Researches into Mechanical Properties of Rocks under Dynamic (Cyclic) Loading J. ancer & V. Petro V B- Technical University of Ostrava, Ostrava, the Czech Republic 1 1...

... rocks for anti-plane shear deformation is mainly investigated here. It is shown that if the angle between the proportional loading path and the direction of the localization 2pi = , then the deformation is stable. This corresponds to the case of neutral loading. The case 2pi > corresponds to elastic...

... Reservoir Characterization lower fault coupling relationship detection temperature field Upstream Oil & Gas anomaly strain field IRR temperature Modeling & Simulation tectonic activity variation Earthquake structural geology rock sample loading strain position fracture...

... reservoir geomechanics Wellbore Design strength wellbore integrity petal crack Surface Flaw crack growth Reservoir Characterization Upstream Oil & Gas growth process flaw flaw plane compression Wong loading homogeneous sample anti-wing crack crack growth process numerical...

... displacement shotcrete utilization loading Upstream Oil & Gas shotcrete lining tunnel shotcrete stress distribution strength measurement Point boundary shotcrete shell deformation force equilibrium calculation lining monitoring point tangential displacement University...

... in rock, the experimental data of electrical resistance were measured with stress or strain changing. The electrical resistance of siliceous-lime marble increases continuously with compressive stress from the initial loading to the greatest stress, but the increasing rate of electrical resistance...

... and Goetzsche, 1996). Singh and Xavier (2005) observed largest overbreak for the joint orientations of 450 and minimum overbreak for parallel and perpendicular joint orientations and similar results were also obtained by Lewandowski (1996). The rock mass damage problem will be manifold if the blast loading...

... dynamic impact resistance application complementary bolt modeling rockbolt dynamic loading numerical model metals & mining permanent strain strain energy dynamic resistance deformation rockburst breakthrough support steel support loading construction beam element ISRM...

... the applied load and the resulting strain. The fact that jointed rock masses do not behave elastically has prompted the usage of the term modulus of deformation, rather than modulus of elasticity, or Young s modulus. The commission of terminology, symbols and graphic representation of the International...