...). casing and cementing scenario salt-reservoir interface johnson upstream oil & gas interface cavern friction simulation displacement deformation pipe closure dissolution petroleum engineer stiffness casing design integrity biaxial axial displacement laboratory experiment Rock...

.... This phenomenon could explain the increased mobility of a frictional material, which can be observed for many large rock avalanches and some small ones as well. This increased mobility manifests itself not only by wider spreading, but also longer horizontal displacement of the center of mass of the deposit...

... formula, cause the adjusting of jacking direction will be more critical compared with its application in shallow strata conditions. metals & mining deviation calculation formula engineering formula coal mining axis resistance friction correction declination pipe stratum coefficient...

... Abstract Based on the Discrete Element Method (DEM), a three-dimensional particle flow code (PFC3D) was used to simulate the penetration process of the large-diameter steel cylinder in sandy soil. The magnitude and variation of sliding friction inside and outside steel cylinder were studied...

... Abstract While many researchers have reported unstable sliding, or stick-slip movement, of smooth joints in direct shear testing, there is no consensus on the physical mechanisms that cause this phenomenon. Some researchers relate this behaviour to an increased static friction gained...

... Abstract The Cohesion Weakening Friction Strengthening (CWFS) is adopted in numerical analysis to capture the observed progressive failure of hard rock pillars. As a case study, pillars at the Elliot Lake mines with width to height ratios of 0.5 to 3 were analyzed in FLAC3D. Pillars with width...

... 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...

... toughness hydraulic fracturing friction Loading Rate application fracture toughness test rock dynamic fracture toughness Harmonising Rock Engineering and the Environment Qian & Zhou (eds) © 2012 Taylor & Francis Group, London, ISBN 978-0-415-80444-8 Application of discrete element method...

... degree about III and II level. In this paper the possibility to estimate the bearing capacity (ultimate tip load and maximum skin friction), as a function of the alteration state, are described. A relationship between this alteration degree and the RMR classification is introduced. Several theories...

... and torsion failures are really shear failures, flexure failure is a combination of tension failure and shear failure, etc), shear strength is the preferred strength parameter for geotechnical materials. Shear strength can be postulated as composed of three main parts: cohesion c , dilatancy and friction...

... metals & mining fault reactivation Durham Coalfield groundwater level groundwater friction mining activity houghton-le-spring groundwater level change Coal Mining Donnelly hydrogeological condition orientation apparent coefficient subsidence pore water pressure ABSTRACT...

... exerted by the ground upon a shield during continuous excavation depends on the TBM advance rate, on the shield length, on the amount of overboring and on the coefficient of friction between the steel and the rock. During a break in operations, the ground pressure increases with time, thereby...

... is in motion, the maximum value of the grid point velocity is higher than a certain minimum velocity. In case the system is not in motion the shear strength (cohesion and/or angle of friction) is reduced by a shear reduction factor, until the system fails. The resulting factor of safety is the ratio...

... of magnitude higher than faults seen on seismic surveys (Yielding et al., 1996). Sediments may already experience prominent grain fracturing at burial depth of 500m when subjected to uniaxial compaction (Chuhan et al., 2003),. friction Upstream Oil & Gas structural geology experiment burial...

... comparison with limited analysis solutions. FACTOR OF SAFETY The global factor of safety The global factor of safety of jointed rock can be computed with it finite clement or finite difference code by reducing the rock shear strength in stages until the model fails. friction global factor...

... with thickness (rolling friction may control this behaviour). RÉSUMÉ: Des essais de cisaillement direct en laboratoire ont ete faits pour etudier la resistance de discontinuites remplies de sols sableux sees. La resistance des discontinuites remplies a ete toujours plus basse que celie des discontinuites sans...

... ABSTRACT: The shear behavior of rock joints is closely related in a complicated way to some factors, such as the confining condition, the material strength, the joint surface roughness, and the material friction. Therefore, it is necessary to investigate the influence of and/or the relation...

... the degradation of friction at the interface and macroscopically the successive reduction of tensile joint strength and shear-mode frictional fracture instability are considered. Limit equilibrium conditions are given as a function of the number of thermal cycles, frictional degradation and the number...

... variation rock joint reservoir geomechanics resistance rock discontinuity du rocher friction normal stress shear stiffness rock mass deformation stiffness Reservoir Characterization criteria in-situ shear test discontinuity shear strength failure envelope dilatancy ., Shear strength...

... tensioning, the surface hardware is pushed, and held tightly, against the rock face. knowledge management friction internal fixture investigation Upstream Oil & Gas reinforcement cable bolt individual component variation relaxation Fixture procedure wedge force metals & mining...