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Keywords: specimen
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Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-410
... laboratory experiments (Gu et al., 2011). propagation shale gas fracture propagation upstream oil & gas modeling & simulation fracture toughness fracture criterion complex reservoir reservoir geomechanics hydraulic fracture propagation scb specimen shale ga reservoir petroleum...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-411
... of the confining stress, injection pressure, field temperature on the volumetric strains of oil sand specimens during injection and compared the water effective permeability variation before and after injection (Wong 1991; Yale 2010). However, the characterization of flow behavior in oil sand during injection has...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-363
... Abstract In this study, Chen and Bazant's microplane damage model for rocks has been implemented into ABAQUS through a VUMAT subroutine. Numerical modeling for gypsum specimens with a single fracture under unaixal compression show the advantage of the model. It can be seen that the macroscopic...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-392
...; the permeability in the irreversible deformation zone in the vicinity of the well used to decline with distance. The stand is manufactured for filtration tests in cylindrical specimens with a central hole loaded at side surface. The laboratory experiments are performed on specimens, made of artificial geomaterial...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-318
... discontinuities, and shear tests on structure planes are unrepeatable. upstream oil & gas particle shear strength shear characteristic zhejiang province characteristic protrusion plane specimen reservoir simulation displacement vector engineering particle displacement vector microcrack...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-337
... Abstract When the discrete element method (DEM) is uded to simulate split Hopkinson pressure bar (SHPB), the comparison between results of numerical SHPB simulation and laboratory SHPB testing shows the strain rate effect of the rock specimen made by bonded-particle model is not obvious...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-107
... Abstract The anisotropy of mechanical properties of rocks is a well-known phenomenon in a rock mechanics. Here, we present an experimental study of the fracturing of anisotropic migmatite with plane parallel structure (foliation). Three specimens, with different dips of foliation including...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-110
... such as insufficient post-peak control, complex sample preparation, or the amount of material needed. Here we present an alternative approach, called pseudo-Compact Tension ( p CT) method, to measure K IC in rocks using disc-shaped specimens loaded in pure tension. The tensile load is transmitted through a couple...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-112
...). upstream oil & gas deformation damage evolution characteristic plastic deformation accumulation loading specimen boundary borehole excavation reservoir characterization characteristic underground engineering rock mechanic elastic plasticity deformation reservoir geomechanics mpa...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-113
... toughness at ambient pressure and tensile strength. Laboratory fracture tests using rectangular specimens under compression load were conducted to examine the validation of the proposed relation. Conclusions could be made that the fracture toughness increase with confining pressure linearly. The rivised...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-117
..., the most important parameter is fracture toughness ( K C ) which is considered as the critical value of stress intensity factor, K . This parameter describes the onset of a fracture in a cracked specimen under a given loading condition. Hence, it is important to determine the fracture toughness of rocks...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-121
... tranquil hydraulic fracturing characteristic fracture reservoir characterization uniaxial compression mechanism amplitude prediction sandstone ae characteristic university significance specimen rock mechanic chinese journal acoustic emission characteristic Rock Mechanics for Natural...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-124
... Abstract Uniaxial compression tests are conducted on prismatic specimens of gypsum, used as a rock-model material, that contain two open flaws and a smooth interface that separates the two flaws. The specimens are 203.2mm high, 101.6mm wide, and 25.4mm thick. The two flaws, with 0.1 mm...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-125
...-static loading. They investigated the initiation, propagation and coalescence of cracks and fracture mechanism leading to the failure of defected rock specimens under static loading. It has been widely accepted that the mechanical behavior and failure characteristics of rocks are closely influenced...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-126
... Abstract The way in which crack develops is critical to our fundamental understanding of failure process of rocks in fields ranging from engineering to geological applications. Here we investigate the cracking behaviors of single-flawed rock-like specimens composed of cement mortar using...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-127
... fracturing complex reservoir configuration criterion journal reservoir characterization deformation hydraulic fracture plastic deformation reservoir geomechanics fracture state key laboratory upstream oil & gas modeling shale gas propagation mpa specimen vector biot coefficient...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-128
... in rock masses under the condition of reservoir-induced seismicity. complex reservoir displacement interface fluid dynamics upstream oil & gas reservoir geomechanics cylinder hydraulic fracturing fracture specimen permeability simulation reservoir characterization rock mechanic...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-129
... Abstract In order to figure out the damage and failure characteristics of Longmaxi shale in deformation and failure under loading, three cylindrical specimens were prepared to conduct realtime uniaxial tests. Micro-focus X-ray computed tomography (μ-CT) at different stress levels were used...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-131
... Abstract In this study, two specimen geometries were used to determine the mode-I fracture toughness ( K IC ) of rock: Semi-Circular Bend (SCB) specimens subjected to three-point bending, and pseudo-Compact Tension ( p CT) specimens loaded in pure tension. We discuss the results of a number...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-132
... specimen in southern Sichuan is determined. Based on the experimental data, the relationships among the fracture toughness of mode I, the density, the acoustic time and the shale content are analyzed, and the prediction model of shale fracture toughness of mode I is established by the geophysical logging...

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