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Keywords: size effect
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Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0028
... pressurized borehole. Different in situ stresses and borehole sizes are considered. In addition, the effect of material ductility and size effect are studied and discussed. The results show that borehole size has an important effect on the crack extension regime. It appears that due to the existence of an...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0518
... ABSTRACT: We extend classical models of tensile failure around a pressurized borehole to include size effects. We use a mixed criterion with a mean stress approximation, including also the effect of pore pressure for poroelastic media. The mixed criterion gives the fracture initiation...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-873
... optimizing costs and production schedules. Reservoir Characterization Wellbore Design US government wet screening strength metals & mining Upstream Oil & Gas cylinder wellbore integrity size effect diameter test result compressive strength TRJV aggregate scale factor...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1005
... ABSTRACT: Size effect is an important factor to consider when the rock mass strength is obtained from laboratory test results. A stochastic simulation method within FLAC 2D was used in this paper to investigate rock size effect induced by rock heterogeneity. No size effect was observed when...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0979
... introduced to reduce the impacts of particle size. Direct tension tests were carried out to investigate fracture process and size effect of mode-I fracture on similar single edge notched beams. A wide range of structure size was used, which was reflected in the depth of beams being used spanning from 1 mm to...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0230
... ABSTRACT: Tensile strengths from the direct tension test and the Brazilian test are compared for the purpose of material property calibration for DEM modeling. We show that size effect in direct tension is statistically insignificant. Sample size is not critically important in calibrating the...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-099
... important results of the models with fracture development to be involved in is the prediction of the dependence of critical internal pressure to cause borehole breakout on the borehole size (Ba ant et al. 1993, Dresen et al. 2010), because the size effect can readily be incorporated into the fracture theory...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-183
... crack. hydraulic fracturing Upstream Oil & Gas stress intensity factor specimen reservoir geomechanics size effect crack length toughness measurement Ankara andesite mode ii stress intensity factor geometry beam depth group Reservoir Characterization intensity factor fracture...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-233
... servo-controlled method in order to obtain the class II rock behavior of a brittle rock in their discrete element numerical simulation. In their approach, the lateral strain was adopted to control the applied axial loading rate. reservoir geomechanics size effect notch tip hydraulic fracturing...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-371
... it relates to rock strength, is well understood; what is less understood is the proper correction factor to use when an appropriate core size is not available, especially under confining pressure. Our research has been focused on obtaining a representative size effect correction for RMP and to...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-800
..., three-point bending tests are advocated to evaluate brittleness in tension. Since size effect is present because of the competition between stored energy per volume and dissipated energy per area, experiments performed in mode I fracture clearly demonstrate brittleness. As a consequence, as the size...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-284
...-point bending tests. The model was calibrated [6] to mimic the mechanical behavior of Berea sandstone. The sandstone has the following physical properties: elastic modulus =14 GPa, Poisson s ratio =0.32, uniaxial compressive strength ARMA 15-0284 Size effect on length and width of fracture process zone...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-639
... Abstract Since the introduction of the point load test, size effect has been observed in the point load strength index. While considerable research has been undertaken to investigate the size effect in the point load strength index, and the general cause of size effect, there has been limited...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7405
... operation strength MPa Poisson triaxial test size effect diameter compressive strength sandstone sample astm correction factor sidewall core elastic property correction factor Symposium Crab Orchard sandstone 1. INTRODUCTION Plug samples obtained from oil and gas wellbores by sidewall...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7622
... also indicate that there is a small-crack growth regime at the beginning stage, where the growth rate decreases as the crack propagates. The fracture kinetics for both the small-crack growth and the Paris regimes is subjected to a strong size effect. During the strength and fatigue tests, the damage...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7757
... strength is different from the Brazilian tensile strength in most cases. In an attempt to explore the potential reasons for such discrepancy, the direct and Brazilian tension tests are compared in the light of size effect and bimodularity. The problem of size effect is investigated using the two approaches...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-181
... Brazilian test. The modeling was focused on size effects and micromechanical insights into the splitting and fracture propagation processes in the Brazilian test. The results of the micromechanical study lead to a scaling relationship to account for the effects of Brazilian test specimen size, and for...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-215
... ABSTRACT: A number of studies have investigated the size effect of intact rock mostly focusing on the uniaxial compression test. The most widely used being that by Hoek and Brown [1]. The authors have conducted a suite of uniaxial compressive and point load tests on some igneous and...
Proceedings Papers

Paper presented at the 44th U.S. Rock Mechanics Symposium and 5th U.S.-Canada Rock Mechanics Symposium, June 27–30, 2010
Paper Number: ARMA-10-131
... such as elastic modulus, Poisson's ratio, crack initiation stress and uniaxial compressive strength are obtained. It is shown that the size of the RVE can be different depending on the mechanical property that is being studied. Reservoir Characterization size effect porosity numerical...
Proceedings Papers

Paper presented at the 44th U.S. Rock Mechanics Symposium and 5th U.S.-Canada Rock Mechanics Symposium, June 27–30, 2010
Paper Number: ARMA-10-237
... experiments aimed at quantifying the size effect on rock fracture toughness. Laboratory tests indicate dependence of rock strength on specimen size. In particular, the nominal tensile stress associated with specimen failure decreases in an empirical power-law relationship to specimen size (e.g. [1]). This is...

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