... the dynamic processes involved in the HF-NF interaction, i.e. evolution of seismicity in HF-NF interactions. hydraulic fracture propagation normal stress seismicity complex reservoir hydro-wing fracture fluid pressure fracture propagation Upstream Oil & Gas mechanism seismic event...

... stresses and shear displacements. From the measured flow rates, the hydraulic aperture was back calculated using the cubic law. During the flow tests, normal and shear displacements/stresses were recorded. Permeability was always reduced by an increase of normal stress whereas the surface roughness has...

... and reservoir. braathen Upstream Oil & Gas injection pressure direct shear test normal stress Reservoir Characterization storage pilot co 2 sandstone shear stress bohloli geomechanical interpretation injection test fracture horizontal stress Svalbard longyearbyen co 2 pilot site...

... laboratory tests. laboratory test oedometer test investigation loading constitutive model Reservoir Characterization Upstream Oil & Gas input parameter normal stress strength parameter specimen annular gap direct shear test Pea Gravel determination lining segment numerical...

... Reservoir Characterization pore pressure rock mass type lining Upstream Oil & Gas normal stress shield skin excavation Fault Zone displacement numerical analysis deep tunnel cross section 60 reservoir geomechanics system behaviour mesh support measure stiffness time...

... coefficient Reservoir Characterization Upstream Oil & Gas CNL condition dilation Wellbore Design normal stress boundary condition dilatation capacity test procedure shear test stiffness shear strength initial stress wellbore integrity resistance direct shear test procedure normal...

... discontinuities under high average normal stress σ n , where the asperities are strongly overlapped and adjusted and the sliding is made with their shear. Engineering roughness strain energy classical limit equilibrium model average normal stress Upstream Oil & Gas Barton Ladanyi discontinuity...

... continuum analytical conventions, and to model joints as discrete features. Joint stiffness is separated into normal stiffness (Kn) and shear stiffness (Ks), which describe the rate of change of normal stress ( n) and shear stress respectively, with respect to normal displacement ( n) and shear displacement...

... that, at the expense of some restrictive assumptions, becomes adequate for computationally efficient explicit inte- gration (Gens et al. 1995). The main simplifying assumptions are perfect plasticity, no dilatancy, and a linear elastic relationship between the normal stress and the normal relative displacement...

...°–30° under constant normal load (CNL) and constant normal stiffness (CNS) boundary conditions at different initial normal stress ranging from 0.10 MPa to 2.04 MPa. The thickness of infill (t), varied from 0, 5, 7 and 10mm over an asperity height (a) of 5mm, which makes the t/a ratio as 0, 1, 1.4 and 2...

... shear bond testing procedures were trialed. The aim of the tests was to evaluate pure shear bond strength of TSL to the various strata types without the effect of normal stress and to choose the most appropriate test for future routine testing. The first test method utilized the standard double shear...

... method to the normal stress measurement The slit local stress relieving method combined with the principle of slit method test and surface stress relieving method. At first, a deep enough slit was cut in rock mass and the normal stress of slit full released. The displacement value of rock mass between...

... mass relies heavily on the constitutive equations representing the behaviour of the joints used in the model. A joint constitutive model mainly consists of vertical closure under normal stress and shear deformation subjected to tangential stress. Joint closure has been investigated extensively...

... stress Reservoir Characterization mechanical loading vertical drill hole cohesive rock effective stress Upstream Oil & Gas pore porosity variation chart apparent value relation normal stress Terzaghi model drill hole cohesive discontinuous rock Rock Mechanics for Resources, Energy...

... the result ofA_TM_1, we can infer that friction angle of granite is also independent on temperature variation in the range of 80 C. Figure 3 shows the relationship between the normal stress and shear stress acting on the shear surface under the room temperature and the elevated temperature. When the water...

... site. Former is for stability analysis of concrete dam resting over rocky strata while later is concerned with the ability of the surrounding rocks to hold the reservoir. Upstream Oil & Gas normal load MPa shear stress displacement normal stress peak shear interpretation interface...

... test is to performa fluid flow in a fracture of a rock sample in THM conditions determined and controlled (Fig. 1): – A cylindrical rock sample is drilled to get the mean plane of the fracture perpendicular to the axis of revolution; – A normal stress is applied to the rock sample...

... pumice tuff, Japan. The changes of shear stress, normal stress, flow rate and process of fracturing on sample surface have been investigated by using a new type coupled shear-flow test apparatus. In this study, we designed a numerical model for the coupled shear-flow test using a discrete element code...

... of rock joints. Three saw-tooth triangular joint profiles with the base angles of 15°, 25° and 35° are generated and the mechanism of asperity degradation of these profiles under different normal stresses are studied. Three mechanisms of sliding, asperity wearing and shearing are observed in the numerical...

... Reservoir Characterization roughness rock joint shear displacement shear test displacement normal stress discontinuity shear strength Rock Mechanics for Resources, Energy and Environment Kwas´niewski & ydz ba (eds) © 2013 Taylor & Francis Group, London, ISBN 978-1-138-00080-3 Developing a high...