... that liner application reduces the magnitude of damage by nearly 23% in both concrete and coal blocks. On the other hand, the dilation angle increases rapidly to its peak value with an increase in plastic shear strain ( γ p ). INTRODUCTION The design of structures in underground rock mass poses a unique...

..., both led to a good match in peak strengths for the entire range of confining stresses tested, although the latter failed to properly replicate the confinement dependency of peak dilation angle and the post-peak response. reservoir geomechanics strength rock mechanics international journal...

... & mining stability Limit Equilibrium Method elastic property SRF Reservoir Characterization dilation angle LEM homogeneous slope slope angle Upstream Oil & Gas SSRT Corps jambu Scenario safety ARMA 18 987 A Comparison of the Shear Strength Reduction Technique and Limit Equilibrium...

... continuum model results recently published by the authors and documented pillar behaviors as seen in the field. Upstream Oil & Gas Martin international journal hydraulic fracturing creighton granite pillar model reservoir geomechanics strength dilation angle Reservoir Characterization...

... as the change in volume associated with shear distortion of an element in the material (Vermeer and Borst, 1984). The dilation angle was first introduced to characterize the dilatant property of a granular material by Bent Hansen in 1958. The dilatancy affects the loading-carrying capacity and the spread...

... Installation and Operations cohesion Reservoir Characterization dilation angle production rate perforation perforation length 0 wellbore perforated wellbore onset perforation orientation friction angle Upstream Oil & Gas stability production time poro-elasto-plastic model perforation...

... et. al, 2013; Riquelme, 2016). Finally, a 3-dimensional geological mapping is built by combining the two images from each of the sensors using automatic feature matching algorithms. machine learning roughness plane Artificial Intelligence digital outcrop model dilation angle discontinuity...

... or by using a parameter called the dilation angle ?. ? is related to de p 1 /de p 3 and is defined as a function of loading history and confinement. Conventional triaxial test data can be used for characterizing rock dilation as a function of loading history and applied lateral confinement (s 3...

... with the non-stressed model. For models with non-zero values of fracture dilation angle, the existence of permeability tensor is not affected by changing in the magnitude of dilation angle when small stress ratio is applied. However, when stress ratio increases up to k=3 or higher, the values of dilation...

... towards developing guidelines for determining the appropriate level of support and design methods for support systems to minimize the risk and severity of injuries to miners from rib falls in underground coal mines. upstream oil & gas coalbed methane dilation angle friction angle residual...

..., and 10 -17 m 2 N-S and vertical, with higher permeability in known fracture zones. Fracture dilation angle, cohesion, and initial fractions of fracture porosity and permeability were varied to reproduce observed flow rates. The best parameters were fracture porosity equal to 0.1% of initial porosity, 2...

... distribution Upstream Oil & Gas stimulation fracture network realization hydraulic fracturing dilation angle contour Injection Rate aperture History injectivity shear-stimulated area stiffness production index fracture propagation ARMA 14-7741 Thermo-Hydro-Mechanical Numerical Modeling...

... to their effect on contact hardening. reservoir geomechanics displacement dilation angle Upstream Oil & Gas reinforcement confinement Reservoir Characterization friction resistance coefficient pullout resistance strength Simulation boundary condition Anchor specimen interface peak force...

... linear regression analysis of the test data was used to develop empirical formulae which define the relationship between the rock properties (failure strength, elastic modulus, Poisson’s ratio, friction angle, cohesion and dilation angle) and the confining pressure and temperature. Reservoir...

... interaction in yielding conditions. Recently, efforts have been made to understand and quantify the complexities of dilation angles in rock, including dependency on confinement stress and plastic shear strain incurred. These current approaches will be reviewed and compared. The effects of dilation...

... to support and reinforce rockmasses. Two primary types of rock bolts exist: active bolts and passive bolts. reservoir geomechanics displacement rockmass joint plane metals & mining strength shear contribution structural geology resistance dilation angle Reservoir Characterization bolt...

... ABSTRACT: a mobilized dilation angle model considering the influence of both confining stress and plastic shear strain is proposed in this paper. The model is used to predict the volumetric-axial strain relationships of a few rocks samples and the results are found to be in good agreement...

... encountered on fracture faces. This second component is the joint dilation angle, and is the focus of this study. Emphasis is not on a preferred method of characterizing roughness, but rather a new technology as a tool to assist in analyzing joint roughness. Using ground-based laser scanning and point cloud...

... model Reservoir Characterization laboratory test Simulation lithophysal porosity udec simulation Upstream Oil & Gas Triaxial Testing dilation angle MPa cohesion compressive strength reservoir geomechanics strength lithophysal tuff lithophysal rock Itasca Consulting Group stiffness...

... ABSTRACT: A simplified model is proposed based on elastoplastic behavior of sandstones with a non-constant dilation angle. The accuracy and reliability of the proposed model is verified by comparing the model prediction with the result of hollow cylinder tests on sandstone. The possibility...