... equation geology geological subdiscipline asperity environmental science 833 shear strength criterion shear strength strength practice iop publishing iop conf aperture theory Mechanics and Rock Engineering, from Theory to Practice IOP Publishing IOP Conf. Series: Earth and Environmental...

... , at which point asperities are "flatten out" and ϕ = ϕ r . The failure surface in equation (1) is non linear, as its slope depends on σ . The larger the value of JRC (Joint Roughness Coefficient), that ranges between 0 and 20, the more pronounced is the curvature of the failure envelope for σ...

...- ences significantly the mechanical behaviour of a rock mass. When asperities are opened, a loss of inter- lock leads to reductions in both normal stiffness and shear resistance (Li et al. 2015a). To simulate the responses of opened joints to normal and shear load- ings, development of a constitutive...

... Abstract A closure model is developed for rough fractures along with a fluid flow model to predict fracture conductivity decline under normal closure stress. The closure model is based on surface asperity and half-space deformation considering the effect of mechanical interaction among...

... not be measured either in the laboratory or in the field, but only calculated. But the forces involved in these processes can be measured and calculated. Now with two discontinuities having homothetic asperities, with the same slope but different amplitude (Figure 1), they slide and yield for the same strength...

... numerical models. The shearing of rock joints involves both sliding on asperities as well as crushing, shearing and tensile failure. To successfully model this complex behavior, the numerical model must be able to reproduce these failure modes. According to Cundall (2000), using a micro-mechanical model...

... in dimensionless variables like roughness inclination. Furthermore, in accordance with classical models (Patton 1966, Barton & Choubey 1977) two homothetical asperities having the same slope but different amplitudes h have exactly the same strength. In effect, the asperity having larger amplitude is stronger...

... that considers the influence of roughness on its surface. Reservoir Characterization roughness Rock Block Contact mathematical development Upstream Oil & Gas mechanism load plate asperity Wellbore Design elastic sphere rigid plate midblock curvature elastic state integration...

... of an in-house developed system which is capable of testing large samples up to 100 cm×100 cm under different monotonic and dynamic loading conditions. Upstream Oil & Gas joint surface laboratory apparatus replica normal load dilation asperity high capacity direct shear apparatus Mortar...

... Physical simulation of asperity degradation using laboratorial shear tests of artificial fractures M. S. Asadi Baker Hughes Inc., Perth, Australia V. Rasouli Curtin University, Perth, Australia Abstract: Hydromechanical behaviour of sheared rock fractures is complex as it high- ly depends...

... of Technology, Perth, Australia ABSTRACT: The shear behavior of a fracture is very complicated due to its surface being rough. Different fracture shearing mechanisms have been introduced in the literature including normal dilation or sliding, asperity cutting and contact area failure. Majority of the existing...

... is presented that reproduces the brittle material as a dense assemblage of deformable triangular particles. Using this, plaster-made samples with saw-tooth asperities are modeled and numerical results are compared with experimental measurement. The investigation approves that the proposed DEM is successful...

... with pervious stud- ies (Yoshinaka et al. 1996, Fardin 2003), ks increases with fracture size in the residual stage. In the initial stage, ks decreases with fracture size since the fracture surfaces are less mated for a larger fracture. However, smaller asperities with shorter wavelengths are more easily...

... hydraulic fracturing wavelet transform optimum mother wavelet Artificial Intelligence roughness JRC profile Signal Energy Upstream Oil & Gas frequency band asperity surface roughness data quality rbio 3 Wavelet analysis exemplar jrc profile JRC exemplar profile wavelet...

... situation, we ensured that the simula- tion model of the high IRC value cause a destruction against the roughness of high asperity. As the shear behavior of rock discontinuity, a phenomenon that both rising upper side of the rock and destruction are caused simultaneously is well described. And, because...

.... In the residual state, however, there are some differences. The differences in the residual state cause the influence of the powder produced by the deleted asperities. The asperities are shaved and the powder plays the role of a ball bearing. In this research work, the theoretical model is improved...

... des Geosciences Appliquees, Universite de Bordeaux I, Talence, France Colette Sirieix -ANTEA, Direction de /0 Geotechnique, Orleans, France ABSTRACT: Joint shear behavior is analyzed in relation with profiles 20 statistical description, 3D statistical modelling of asperities angularity, geostatistical...

... the justification for a postulated stress boundary condition scaling law, and presents experimental results which demonstrate these scaling laws on both simplified joints comprising regular triangular asperities, and on complex joints derived from fractal geometry principles. RESUME: Cet article discute la base...

... ABSTRACT: It is considered that the surface profile of rock joint roughness considerably affects the shear behaviour of rock joints. Irregular joint surface consists of various asperity shapes ande gradients, and it seems that the shear behaviour might be dominated by the large gradient...

... of the asperities, has been proposed by Amadei and Saeb. The paper describes its extension to three dimensional situations as well as cyclic loadings and illustrates its possibilities on two simple examples. RESUME: Un modele de fracture rocheux bidimensionnelle, permettant de rendre compte des couplages entre les...