... approximate the scale effect on the strength of shale rock, which is incorporated within the coal mass model and guides the strength reduction. Finally, a comparison study was conducted with three models, one with solid Banded-Bright coal (BBC) and the other two with rock partings sandwiched with BBC...

..., to determine their nominal strength and investigate scale effects in regards of test configuration and size of test specimens. Specimens were loaded either diametrically to determine their splitting tensile strength using the Brazilian test configuration, either axially at five (5) levels of confinement, i.e...

... ABSTRACT: A consequent slope comprises weak planes in the same dip direction along a slope face. This study investigated scale effects on the gravitational deformation of consequent slopes. A series of centrifuge model tests under simplified environmental conditions were performed. Particle...

... ABSTRACT: It is well-known that the risk of sanding varies for different completion systems, i.e. open hole versus cased and perforation, in a given wellbore and reservoir. Part of this difference comes from the scale effect of the borehole. Pragmatic approaches are usually taken to consider...

... Abstract This paper deals with the scale effects on deformability of rock mass in Himalayas by conducting in-situ tests with different methods. The deformability tests conducted by using plate jacking test, plate loading test, Goodman jack test and laboratory test show the comparison among...

... from one situation to the other. Calibration of numerical models with more laboratory tests will validate them to be used in later developments. Upstream Oil & Gas scale effect joint surface discontinuity numerical evaluation horizontal displacement normal stress strength reduction...

... Abstract: The design of structures on or within a rock mass requires an estimate of the strength of the intact rock blocks within the mass. These blocks of rock can be many orders of magnitude greater in scale than the core samples typically tested. Including the scale effects into a failure...

... of an additional scaling rule in dealing with properties like strength and facture toughness that exhibit a scale effect is addressed. An example of brittle fracture in a concrete structure, and the determination of a scaling rule for the scale effect in fracture toughness are presented. The fracture of brittle...

... ABSTRACT: The mechanical behavior of rough rock joints can vary as a function of scale. Characterization of this scale effect can be problematic due to the difficulties in performing shear tests on larger rock joint specimens. This paper investigates the use of the 2D Combined Finite-Discrete...

... geologic modeling complex reservoir scale effect Reservoir Characterization Upstream Oil & Gas geological modeling structural geology Rock mechanics slope stability analysis particle discontinuity Ore Deposit metals & mining strength international journal representation...

... a scale effect. The results show that 3.8 cm samples produce more representative in-situ rock deformation behaviors. Our data explain why the bottomhole drilling simulator test using a bigger tuff sample indicated typical ductile (plastic) deformation that showed inefficient drilling performance when...

... ABSTRACT: The scale effect of the hole size on the onset and development of sand production was studied in a series of sand production tests with fluid flow on outcrop sandstone specimens. The onset of sand production was shown to vary inversely with hole size, in agreement with established...

... ABSTRACT It is largely recognized that the uncertainty in predicting the mechanical behavior of a naturally fractured mass is associated with scale effects. In this paper, a coupled Discrete Fracture Network (DFN) - Fracture Mechanics approach is applied to the characterization of rock mass...

... and environmental domains. One of the main issues in geotechnical characterization, particularly in rock mechanics is the scale effect, i.e. extrapolation of results of laboratory size specimens to rock mass conditions. One of the most frequent mechanical tests to determine the strength of rock material...

... RMR rock mass deformability Upstream Oil & Gas scale effect GPa reservoir geomechanics strength Rock mechanics structural geology empirical method Rotterdam Balkema Palmström Bieniawski Hoek Symposium deformability deformation modulus rock mass deformation ARMA/USRMS 06...

... geomechanics Wellbore Design wellbore integrity strength variance structural geology platen rock strength rock type conglomerate Upstream Oil & Gas Rock mechanics ball bearing significant difference deformation parameter scale effect variability determination Point Load Testing...

... ABSTRACT: Scale effect is a phenomenon of increasing importance in rock mechanics and particularly in the field of rock joints, and as large scale experiments are difficult to handle, numerical modeling can be considered as an alternative way to study the macro joints mechanical behavior...

..., the concept of scale effect in roughness anisotropy has been investigated. This sampling technique and associated analysis allows us to investigate anisotropy of surface roughness in a new way. INTRODUCTION The structural and mechanical behaviours of rock masses are complex, due to the presence...

.... Reservoir Characterization Upstream Oil & Gas correspond structural geology Simulation metals & mining scale effect energy release increment eigenvalue analysis excavation Magnitude time step random mesh equation coefficient Horizontal position Wellbore Design eigenvalue cohesion...

... there is a considerable scale effect under external oading (Papamichos and van den Hoek, 1995) resulting in bifurcation with much smaller wave numbers rn. The critical wave num- ber is governed by the ratio of the hole size over a microstincture l ngth (e.g. grain size) (Papanastasiou and Vardoulakis, 1989, 1992...