... fracture shape fracture toughness viscosity radial confinement free surface experiment Detournay assumption near-surface hydraulic fracture experiment fracture radius toughness Injection Rate hydraulic fracture fracture propagation asymptotic solution ARMA/NARMS 04-468 Toughness-dominated...

... on the other principal stress measurements based on fracture breakdown pressure. It proposes replacing the constant pressure assumption with a parabolic distribution. This would mean that the least in-situ principal stress is equal to 2/3 of the fracture re-opening pressure. The paper also discusses...

... & Gas depletion pore pressure reservoir depletion fault reactivation reverse fault stability assumption normal fault instability boundary fault inclination inclination expression perturbation fault stability destabilize poroelastic effect reservoir boundary reservoir friction angle...

... and creating a cavity or tunnel in the target. Completion Installation and Operations Upstream Oil & Gas strength oilfield target material stagnation pressure rock strength jet density assumption charge penetration application dynamic loading Walter loading jet velocity...

.... The assumption of zero stress results in very conservative results for certain cases. The stability of a wedge in the roof of an excavation is an example. Such a wedge fails by falling under the influence of self-weight. Traditional stability analysis approaches (which do not take stress into account) predict...

... Characterization metals & mining drilling operation structural geology Upstream Oil & Gas strength seam prediction collapse debris bedrock Engineer assumption landfill subsidence equilibrium analysis rock mass construction case study exploration settlement clubhouse site Clubhouse...

... & Gas strength displacement Frictional Resistance Thickness Tharp febrf Salamander Cave deflection assumption span bedding plane joint Breakdown Mountain Room individual beam axial load bedding plane flexural rigidity Pacific Rocks 2000, Girard, Liebman, Breeds & Doe (eds) © 2000...

... with a blunt cutter proposed by Detournay and Defourny (1992), which will be referred to as the DD model in the following. The DD model is based on the assumptions that the total force acting on a cutter is the sum of forces that act on the cutting face and on the wear flat (which often exists...

... into account in the structure of the yield function, in that of the flow rule and of the short term failure criterion by means of a constant anisotropic fourth order tensor. No a priori assumption is made concerning the existence of a viscoplastic potential. A procedure to determine the constitutive parameters...

... ABSTRACT : Conventional key block approaches are generally based on the unrealistic assumption of infinite fracture planes defining wedges, and without consideration for the structure of fracture location. A more realistic approach has been developed based on bounded fractures and realistic...

... passman viscosity particle proppant velocity momentum transfer boundary condition coefficient assumption velocity profile constituent only rigid motion fraction material density equation fluid phase Rock Mechanics, Nelson & Laubach (eds) © 1994 Balkema, Rotterdam, ISBN 90 5410 380 8...