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Keywords: size effect
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Proceedings Papers

Paper presented at the 57th U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2023
Paper Number: ARMA-2023-0440
... microscopic explanations for different size effects observed in UCT and BT, which can bridge the gap between laboratory-scale strength data and field-scale applications. INTRODUCTION Rock engineering applications often require assessing the strength and failure characteristics of rock masses. These rock...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1265
... develop micro and macro cracks which eventually could end up to complete disintegration and failure. Brazilian specimens with different sizes were numerically modeled. Each specimen contained a notch so that fracture mechanics size effect under high strain loading rate could be studied. The specimens were...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0028
... a 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...
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-2018-1005
... 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 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 strength wet screening diameter proceedings wellbore integrity size effect 12-in cylinder metals & mining Upstream Oil & Gas cylinder test result compressive strength seymour...
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...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0979
... 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 2000 mm...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-099
..., the understanding is still elusive for stable development of breakout configurations in the presence of very high compressive stress concentration. wellbore integrity size effect Mining Science hydraulic fracturing high stress zone confinement borehole wall breakout shape reservoir geomechanics...
Proceedings Papers

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

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-233
... 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 Reservoir Characterization Upstream Oil & Gas...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-371
... as 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 document what...
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
... artificial intelligence linear regression analysis material ductility process zone fracture toughness beam size apparent fracture toughness equation different beam size size effect machine learning different realization hydraulic fracturing ARMA 15-0284 Size effect on length and width...
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-2014-7757
... 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 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7405
... correction factor Symposium Crab Orchard sandstone strength astm correction factor sidewall core elastic property size effect diameter compressive strength correlation sandstone sample MPa Poisson triaxial test ARMA 14-7405 Size Effects on Triaxial Testing from Sidewall Cores for Petroleum...
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 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-181
... the 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...
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...

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