... joint specimen shear behavior shear stress reservoir characterization joint surface rock joint shear test displacement rock bolt cn condition peak friction coefficient deformation specimen normal stiffness initial normal stress upstream oil & gas normal stress boundary...

... specimen shear strength canada halite-clay 506 laboratory shear stress stiffness residual test direct shear machine normal stiffness carlsbad halite-clay 3 0 shear displacement interface canada halite-clay 507 1. INTRODUCTION Extensive collaborations between American and German salt...

... management strength rock bolt Artificial Intelligence Simulation excavation rock bolt model Reservoir Characterization displacement shear stiffness shear test rock mass tunnel deformation smooth-joint model normal stiffness bolt body Upstream Oil & Gas inward displacement rock bolt...

... fracture network kPa stiffness permeability normal stiffness Scenario propagation interaction 1. INTRODUCTION It is well known that the presence of discontinuities plays an important role in the production of naturally fractured reservoirs. Fracture intensity, fracture aperture, and fracture...

... ABSTRACT: How to rapidly and accurately determine joint normal stiffness in rock mass is an important issue in rock engineering. In this work, a new method, i.e., the rapid evaluation method, was introduced to determine the normal stiffness of joints. This method was derived from one...

... ABSTRACT: This paper deals with the following two shortcomings of the smooth joint contact model (SJCM) used in the particle flow code (PFC): (a) Use of a constant value for joint normal stiffness instead of allowing actual non-linear behavior between the joint normal deformation and joint...

... by the parameters of smooth joint including friction coefficient, normal stiffness, and shear stiffness. The friction coefficient is found to have the most significant impact on the macro properties including yield strength, Young's modulus, and Poisson's ratio. A reduction in friction coefficient significantly...

... of anisotropic rocks with different anisotropy angles under uniaxial compression condition. The Young’s modulus is found to increase significantly with the SJ normal stiffness when the anisotropy angle is low (0°-30°). The USC increases with the SJ normal strength at high anisotropy angle (ß>60°) while...

... interaction sensitivity analysis indicates that neglecting interaction among asperities may lead to erroneous results particularly in surfaces with closely spaced asperities. By conducting an analysis on the elastic properties of asperity and half-space we found that the normal stiffness is much more...

... normal loading condition. However, it is widely accepted that the shear strength of rock joints is controlled by the inherent stiffness of the rock. In this paper, experimental study of the shear behavior of joint under constant normal load (CNL) and constant normal stiffness (CNS) were undertaken...

... Reservoir Characterization joint stiffness complex rockmass MPa normal stiffness rockmass behaviour reservoir geomechanics orientation shear stiffness excavation scale intrablock structure mineral stiffness joint element Upstream Oil & Gas displacement vein strength property thin...

... change proportionally with the bonding condition (e.g. normal stiffness) of rock-concrete interface. As the concrete grade decreases, the third mode of frequency also decreases gradually while the variation of the first two modes of frequencies vanishes. Additionally, the field microtremor measurements...

... characterization layer thickness normal stress Reservoir Characterization Upstream Oil & Gas fracture length stress state reservoir geomechanics aperture displacement scaling intrinsic stiffness stress level specific stiffness stiffness specific normal stiffness fracture hydraulic fracturing...

... rock stiffness is a stress level dependent parameter in fractured rocks. This study reveals that a new physical parameter ( n ) affect the normal stiffness of fractured rocks. The stress dependent normal stiffness in fractured rocks is modeled as an empirical power law function of effective normal...

... because the gouge is soft to easily deform under the applied normal stress and the gouge materials are distributed non-uniformly around the contact areas. Thus, the normal stiffness during shear decreases not only with the decreasing matedness between the surfaces, but also with the presence of gouge...

... ABSTRACT: The mechanical and hydraulic properties of subsurface fractures are of importance to many aspects of hydrocarbon reservoir production, characterization,nd management. The specific normal stiffness is a fracture mechanical property that may be inferred from sonic and seismic data...

... Wales Simulation MPa normal stiffness fracture characterization modeling experiment rock mass particle model Upstream Oil & Gas acoustic emission strength Hawkesbury sandstone application rock mass uc sandstone synthetic rock mass modeling stiffness 1. INTRODUCTION Synthetic rock...

... is the residual friction angle in the case of weathered joints. When joints are unweathered, JCS equals the unconfined strength of the rock (s c ) and f r equals the basic friction angle (f b ). The joint normal closure is related to the joint normal stiffness (k n ) that was found to approximately depend...

... ABSTRACT: A simple model of a rock fracture is developed. The void space of the fracture is assumed to consist of parallel, periodically spaced tubular channels of elliptical cross-section. The apertures of the channels follow some arbitrary statistical distribution law. The normal stiffness...

... with respect to geometricharacteristics of fracture surfaces for constant normaload and constant normal stiffness conditions. For the coupled hydro-mechanical system of a fluid-filled rock fracture, hydraulic pressure inside a rock fracture was used to calculate fracture deformation. It is shown...