... recession and utilizes a fracture mechanics criterion to predict the onset of spallation at critical flaws within a thermoelastic stress field. A fundamental assumption of the model is that critical flaw sites are located at the grain boundaries. This introduces the grain size naturally into the formulation...

... fine granular matters migrate with water flow, part of them loses, which alters the structure and strength of the fractured rock, the grain size distribution (GSD), local stress and seepage fields. When increasing granular matters are lost, porosity and permeability increase, seepage system becomes...

...1. INTRODUCTION Rock heterogeneity is an important factor controlling fracture initiation, accumulation, and propagation within rock destruction. Internal spatial variability in terms of mineralogy, grain sizes and anisotropy affects the yielding process (Marlène C. Villeneuve et al, 2012). Rock...

..., over 60% decrease in grain size due to extensive grain damage and changes in coordination number and contact radius. We used image-derived porosity, grain radius, contact number and contact radius to compute P-wave velocities with the Hertz-Mindlin model. Our observations showed that numerous...

...1. INTRODUCTION The effect of grain size (or scaling) on the mechanical behavior of rockfills has received increasing attention in the engineering of dam and railway embankments (Frossard et al., 2012; Alonso et al., 2012). It has been shown that rockfill specimens with larger mean grain size have...

... and Operations strength grain size Potyondy buckling-assisted fragmentation hydraulic fracturing TWC test CG material damage process fragment Microstructure resolution fracture flat-jointed material fragmentation confinement Castlegate sandstone specimen shear fracture 1. INTRODUCTION...

... ABSTRACT: This paper focuses on the simulation of localized compaction in granular rocks. For this purpose, a continuum framework referred to as Breakage Mechanics is used to capture the role of microscopic crushing on the mechanical response of grain assemblies. In particular, grain size...

.... Another source of uncertainty is the poor characterization of the rocksalt body's physical properties spatial distribution. Here we touch upon rocksalt grain-size and chemical composition as two such major uncertainties and discuss the effects this can have on the overall subsidence response. We finish...

... a relatively small rock sample with realistic grain size. It has been shown previously that the cutting specific energy, derived from the tangential force, estimates the specific energy. In this study, mechanical properties of a Bentheimer sandstone was determined by laboratory testing. The commercial Particle...

... properties such as permeability and water retention curve (WRC). This paper addresses the continuum modeling of grain crushing in unsaturated sands within the framework of the Breakage Mechanics theory. This choice enables us to discuss the role of an evolving grain size distribution (GSD) on both mechanical...

... subsidence pressure decrease fluid dynamics rocksalt flow shear stress pore pressure decrease viscosity deformation upstream oil & gas surface subsidence rocksalt reservoir characterization simulation reservoir geomechanics grain size maxwell time subsidence geometry 1. INTRODUCTION...

... evaluation and development of CO 2 storage potential in the North Sea. tensile strength shale upper jurassic draupne formation bedding plug rubble zone anisotropy reservoir characterization skurtveit grain size lineation reservoir geomechanics fracture core section 1 north sea...

... at grain boundaries are also observed in the bulk of the material, as indirect signs of GBS. Reservoir Characterization Imaging incompatibility halite contribution plasticity grain size procedure bornert deformation investigation Upstream Oil & Gas full-field measurement mechanism...

... the prediction of the onset of deformation band formation. The predictions of the model are compared to an extensive set of experimental compressibility measurements. Parameters describing the effects on uniaxial compressibility for sorting, angularity, and grain size are reported for pure quartz sands. Models...

... in powder engineering. rail transportation cumulative gsd grain size grain size distribution Upstream Oil & Gas normalized grain size assembly ground transportation granular assembly thermodynamic framework sequence case 3 granular material evolution ballast modeling particle...

... investigates the role of grain size on the process zone and size effect parameters by conducting a discrete element simulation of rock fracture. A softening contact bond model is used to study the development of the process zone around a notch tip in three-point bending tests. The numerical simulation...

... discontinuous flaw Reservoir Characterization fracture intensity fracture characterization grain size strength mean grain size flaw through-going flaw Upstream Oil & Gas heterogeneity rock mass strength grain-based model grain size distribution mineral grain 1. INTRODUCTION A rock mass...

... with different grain sizes Shao, S.S. Department of Civil Engineering, Monash University, Melbourne, Victoria, Australia Ranjith, P.G1 and Chen, B.K.2 1Deep Earth Energy Lab, Bld 60, Monash University, Melbourne, Victoria, Australia 2Department of Mechanical & Aerospace Engineering, Monash University, Melbourne...

... microstructure size, such as the size of marble grains, leads to an different extent of damage for a brittle material. Existing work has used acoustic emissions or laser interferometry and optical microscopy to answer this question, and found a positive relationship between grain size and size of the FPZ. Our...

... reservoir. climate change subsurface storage compressibility curve mean grain size ductile grain flow in porous media Reservoir Characterization Upstream Oil & Gas cement unconsolidated sand production time-scale compaction behavior reservoir geomechanics Fluid Dynamics compaction...