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Keywords: confinement
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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1250
... the weighted average of each given contact property constant for all simulations. Both a UCS and a Triaxial test with 12 MPa of confining pressure were simulated for each case to evaluate the effects of heterogeneity under unconfined and confined conditions. Rock specimen properties were computed from...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1790
... here to derive rock mass properties for breccias of varying clast/matrix ratios. An important finding of this work is that clast-dominated breccias may have higher friction angles at low confinement when compared to either of the constituents. This finding is in line with laboratory testing...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1103
.... This is especially true in triaxial tests where the confining stress suppresses the formation of local tensile stresses within a specimen. It follows that a BBM developed to simulate rock behaviors over a wide range of confinements should allow for both grain boundary cracking as well as cracking or damage within...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0305
... and then tested under different confining pressures and temperatures varying from 25°C to 175°C. By examining the thermally induced microcracks, stress-strain curves as well as the distribution of microcracks in the numerical specimen, the micro-mechanisms of rock strength variation can be interpreted...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0390
... a linear relationship until residual failure where frictional sliding dominates. This important finding reveals, for a large range of pressures, that stress-damage evolution in triaxial space is variable with confinement. This could lead to plastic strain and stress dependent damage evolution laws for more...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1612
... ABSTRACT: Deformation features of rocks exhibit dependences on both strain rate and confinement, understanding dynamic mechanical behaviors of rocks under confinement conditions is of significance in dealing with various rock engineering fields, such as underground excavation, penetration...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2239
... ABSTRACT: Compactive deformation in brittle-ductile transition involves particle crushing, cement bond breakage and pore collapse in porous reservoir rocks while subjected to high confining stresses. Despite knowing the overall hydro-mechanical response of porous reservoir rocks, quantitative...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1675
... of peak strength and elastic properties (Young's modulus and Poisson's ratio), as measured through unconfined or confined (triaxial) testing. However, with the advent of stiff, servo-controlled loading frames able to collect accurate post-peak data during triaxial tests, it is also possible to estimate...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1873
... to be tested at multiple confinement stages and for the full intact rock strength curve to be determined for each sample, including the shape of the curve at small confinements. The residual intact rock shear strength was also tested in stages at the end of the tests. Such a variety of tests on one sample...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1872
... will decrease with the increase in rate of penetration. Modeling & Simulation Engineering leakage pressure Upstream Oil & Gas confinement propagation leakage drilling operation critical point extension limit leakage cavern leakage horizontal well prediction model Directional Drilling...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1930
... experimentally investigated under hydrostatic and deviatoric compression at drained, undrained and unjacketed conditions. Tests were conducted up to a confinement state of 60 MPa (8700 psi). The results revealed that drained and undrained bulk moduli, Young's modulus, Biot and Skempton coefficients are highly...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1158
... strength in quartzite beds within Troy's mountainous terrain. The model elucidated that the dipping orebody geometry in relation to topography led to shear stresses in pillars at Troy Mine. Shear stresses resulted in significant loss of confinement in pillar cores (many theoretically in tension), even...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1278
... the uniaxial testing frame. The platens apply equal loading in both directions (s 1 = s 2 ) until specimen failure. In addition, a confining device was used to perform separate biaxial tests under constant intermediate principal stress (s 2 = constant). The failure modes and peak strength of sandstone...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1208
... the elastic modulus, direct-tension strength, and compressive strengths up to 6-MPa confinement. compact rock confinement specimen Reservoir Characterization strength installation gap Lac du Bonnet granite hydraulic fracturing Martin bonded-particle model compression test Upstream Oil...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-830
.... Upstream Oil & Gas triaxial cell confinement Masoumi rubber sleeve Reservoir Characterization LVDT Rock mechanics international journal MPa confinement Engineering roshan hoek cell radial deformation reservoir geomechanics Triaxial Testing triaxial experiment permeability experiment...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-423
... ABSTRACT: This experimental study on rock salt is dedicated to the measurements of water and gas permeability under confinement and to a characterization of the poromechanical behavior. Poromechanical experiments with gas highlight the effect of an internal fluid pressure on mechanical...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0009
..., and discontinuity dip and properties) can be used to create site specific empirical design charts. metals & mining esterhuizen numerical analysis Reservoir Characterization pillar strength strength formula discontinuity height ratio structural geology strength confinement design chart rock...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0099
..., the effect of different fracturing fluids on fracture permeability is investigated using the same fractured siltstone sample in five rounds of cycling test (CO 2 -CO 2 -CO 2 -water-CO 2 ). The experimental results reveal that the maximum confining pressure dominated fracture permeability. The fracture...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0167
... on a same core sample (sister samples). It is the aim of this paper to present an overview of recent Vaca Muerta research works which include mechanical laboratory characterization of the rock and discuss about how different laboratory test parameters such as temperature, confining pressure, time, and fluid...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0223
... 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...

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