... of asperities degradation during the test. The friction angle obtained is 72° for the peak and 58° for the residual. The high values of friction angle indicates that first-order roughness and good interlocking of the joint surfaces can result in high shear strength parameter values in a rock generally regarded...

..., as a preliminary stage of the research, to investigate shear characteristics of a joint surface under various hydro-mechanical (H-M) conditions, triaxial tests were conducted on synthetic rocks including rough shear surface. To reproduce identical joint surfaces, the samples were made of high strength cement using...

... model (1973). Further, cohesion ϲ and angle of friction ϕ of joint surface in each direction is determined. Finally, a relationship between angle of friction ϕ and joint roughness coefficient (JRC) is developed. Experimental shear strength and Barton's shear strength is compared and it is found...

... Reservoir Characterization displacement 13th international congress loading test shear strength Upstream Oil & Gas rock mechanics isrm13 rock joint tiny window loading condition cyclic loading condition shear displacement peak shear strength joint surface shear mechanism load...

... joint surfaces or particular equipments are adopted for the test. In the proposed method, a joint surface is modeled as a group of triangular planes and each plane is examined on contact condition by calculating the relative displacements from initial locations of both surfaces. This joint surface model...

... by a pair of tie rods to a horizontal jack and constrained to have only vertical movement and rotation. These shear rods are aligned along the joint surface and consequently measure shear load, devoid of augmented moment. This apparatus has two normal loading jacks in order to control the inclination...

... from the data of many shear strength tests on various sizes of artificial and natural joints empirically, e.g. 4, 5 . size effect Barton joint surface Rock mechanics specimen length Upstream Oil & Gas joint specimen rock joint specimen shear stress specimen size joint surface...

.... In turn, the properties of the individual joints and fractures, such as their strength, deformability, and permeability, are greatly influenced by the surface roughness of the joint surfaces. Among all factors that influence the behaviour and the stability of rock masses, fractures play a major role...

... has been developed that is capable of completing a 1-dimensional flow test during the shear test 2 . Artificial Intelligence Wellbore Design joint surface hydraulic conductivity spatial reasoning geographic information system asperity height Completion Installation and Operations...

...: One of the major unresolved problems in rock mechanics is the quantitative characterisation of roughness of rock joints. Surfaces of two natural rock joints were measured by a 3D-laser technique. Standard deviation of the asperity heights, spherical variance of the asperity slopes and power spectral...

...) of these discontinuities. The Vryheid Formation is part of the Ecca Group and is of Permian age. Reservoir Characterization choubey roughness metals & mining Upstream Oil & Gas Barton reservoir geomechanics displacement portable shear box compressive strength strength joint surface MPa journal...

... results were presented. All the samples tested were 16 cm long and 5 cm wide. The geometry of the joint surfaces, shown in Figure 1, included triangular, trapezoidal and sinusoidal teeth and casts from two real joint surfaces. The samples were prepared using a mixture with plaster of Paris. The unconfined...

... ABSTRACT: We monitored AE (Acoustic Emission) events during progressive excavation of an underground powerhouse. Fault-plane solutions obtained for located AE events were discussed. The solutions were consistent with the initial stress state, directions of dominant joint surfaces and shape...

.... 1. Evaluation of jointing characteristics on drilling cores from prospect boreholes on side-wall of prospect shafts MARKING OF THE ROCK BODIES water injection measurements discharge measurements observation of water-flow along joint surfaces water permeability experiments in laboratory establishment...

... Upstream Oil & Gas direct shear test shear direction geometry Reservoir Characterization vertical displacement displacement perpendicularly shear force shear resistance shear test joint surface strength shear box knowledge ellipse normal force steel bolt diameter test...

... reservoir geomechanics roughness classification system Artificial Intelligence joint surface rock mass property Reservoir Characterization Upstream Oil & Gas joint amplitude maximum amplitude planarity amplitude data collection metals & mining classification category ROCK...

... on the mechanical behaviours of each shape of the caverns are discussed. laboratory test joint surface discontinuity rock mass mechanics theory net stress ichikawa excavation stage Upstream Oil & Gas kyoya mechanical effect horizontal direction Cauchy stress cavern discontinuous rock mass...

... stable-unstable transition Upstream Oil & Gas rock slope stability relation cohesion peak strength progressive failure process Reservoir Characterization strength Slope Model experimental study discontinuity upper surface joint surface centrifuge experiment failure process...

... stiffnesses for joint set 1 are Kn1 and KS1, Kn2 and KS2 for joint set 2. Shear strength of joint is represented by cohesion c, and friction angle ø of joint surface. 4. EXPERIMENTAL RESULTS AND ITS CONSIDERATION ON BIAXIAL COMPRESSION TEST RESULTS OF JOINTED ROCK MASS MODEL Biaxial compression test...