..., fractures tend to initiate from stress concentration points and propagate during the UCS test, causing further stress concentration due to the creation of high-stress zones by the crack tip. In the anisotropic model, fractures usually occur in areas where quartz and feldspar are more concentrated because...

... upstream oil & gas numerical method numerical code hydraulic fracturing uc test failure criterion reservoir characterization fracture pattern cohesive zone model international journal bt test tensile strength reservoir geomechanics engineering simulation mesh finite-discrete...

... saturated brine injection. We used a medical CT scanner (SOMATOM Definition AS, Siemens) in this research (Zhang et al., 2016b). 2.4. UCS test Once the samples finished flooding test, the UCS test conducted immediately. Congruent with ASTM standards, the compression loading was applied at a rate of 0.1 mm...

... to monitor the strain under the tensile conditions of the test. A strain gauge was also mounted along the circumference of two samples, although this proved less effective for recording the resulting strain. 2.3. Experimental Procedures For UCS tests, the cylindrical core samples are placed in the middle...

.... This indicates that the bedding planes may represent weak planes which tend to fail before intrinsic failure occurs, whenever the orientation of these planes is suitable. Reservoir Characterization reservoir geomechanics orientation UC test weak plane failure plane stiffness strength failure...

... strength (UCS) tests in 3D using the hybrid FEM/EM code ELFEN. The fracture pattern and mechanical response of 3D models are investigated and the results then compared with the equivalent 2D models. As a part of an ongoing research at Simon Fraser University, a Damage Intesity parameter (D21) is introduced...

... shapes against the occurrence of rockburst. The rectangular tunnel produced the highest magnitudes of the rockburst indicators and proved to be the most unstable of the three geometries which were tested. platen failed zone rectangular tunnel rockburst tunnel shape UC test specimen finite...

... ABSTRACT: In this study a series of numerical analysis have been carried out to assess the suitability of the FEM/DEM technique to simulate UCS test of a horizontally layered material, the Montney shale. The strength parameter of the Montney samples reported by Keneti and Wong (2011) were used...

...]. Therefore, laboratory work was carried out in the University of Nottingham to obtain the stress-strain properties for weak materials. structural geology coal plane metals & mining UC test particle size Upstream Oil & Gas compressive strength friction angle experimental investigation...

... a number of UCS tests on seven different sedimentary rocks. Interestingly, he observed that at small diameters (less than 54 and 38mm) the trend of the size effect was not in agreement with the Hoek and Brown equation and was in fact reversed (Figure 2). Figure 2. UCS tests on seven different sedimentary...