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Keywords: direct shear test
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Proceedings Papers

Paper presented at the 57th U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2023
Paper Number: ARMA-2023-0309
... displacement stiffness direct shear test ARMA 23 309 Geomechanical Characterization of Natural Shale-Sandstone Interface Lloyd-Mills, Frank Department of Mineral Engineering, New Mexico Institute of Mining and Technology, Socorro, NM, USA Imerys USA Inc., Roswell, Georgia, USA Cheng, Jingyi Department...
Proceedings Papers

Paper presented at the 57th U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2023
Paper Number: ARMA-2023-0350
.... The shear stiffness of the foliation can be determined based on direct shear tests conducted on the slate foliation. The lab test indicated that the shear and normal stiffness increased linearly with the applied normal stresses. Hence, the variations in shear and normal stiffness are described below. = + (3...
Proceedings Papers

Paper presented at the 57th U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2023
Paper Number: ARMA-2023-0520
... is investigated in this study. Plaster joint specimens having regular sawtooth asperities of 0.4 and 0.8 mm lengths were generated using high quality 3D printer and silicone molds. Direct shear tests at four different normal stresses were conducted on them and the results show that the 0.8 mm asperities...
Proceedings Papers

Paper presented at the 57th U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2023
Paper Number: ARMA-2023-0706
... processes resulting in considerable changes of joint surface morphology often classified with joint roughness coefficients. We carry out direct shear tests on Upper Jurassic carbonate samples with photogrammetric recordings of the joint surfaces before and after shear testing. To compare the surface...
Proceedings Papers

Paper presented at the 57th U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2023
Paper Number: ARMA-2023-0806
... a series of direct shear tests. Several sources of variability in direct shear test results are recognized by the geotechnical community (e.g., the inherent variability of shear strength in a rock mass, joint roughness), but the effect of variations in testing equipment, testing methods...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1566
... specimens with machined asperities. The artificial seams were consolidated at 3000 psi hydrostatic stress, and the excess pore fluid was drained. During consolidation, the clay seams hardened and reduced to about one-fourth of their unconsolidated thickness. Direct shear tests were performed...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1630
... and their source characteristics as well as their effect on rock engineering structures. In this study, despite some difficulties, the author would propose a general procedure to simulate shear loads in direct shear tests of discontinuities and interfaces due to ground motions caused by earthquakes. Furthermore...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1959
... of interaction in both numerical and experimental analyses. In this study, we conducted a set of Direct Shear Tests on Opalinus Clayshale specimens employing a shear box to obtain the coefficient of friction and cohesion of the sliding surfaces. Two conditions were tested: vertical and horizontal bedding planes...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1757
... direct shear test predict side shear resistance shear resistance stiffness pile-rock interface side shear resistance 1. INTRODUCTION Rock-socketed piles loaded axially might transfer the working load by the combination of base and side shear resistance, or only by base or by side shear resistance...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2043
... and failure profile in direct shear test and on the stress relaxation behavior in the post-failure region. Reservoir Characterization rock joint shear plane JRC viscous behavior normal stress strength specimen plane Upstream Oil & Gas direct shear test failure plane time-dependent...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-220
...). In an attempt to resolve this unsatisfactory situation, the writers conduct a series of direct shear tests on saw- toothed mortar joints to investigate shear mechanisms of a single asperity and interactions between asperities. ARMA 18 220 Experimental and numerical investigations on nonlinear shear behavior...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1169
... geometry and stress conditions. In this work, 22 broken rock surfaces were scanned using an Advance Topometric Sensor (ATS) and consequently tested in direct shear. The quantified surface measurements were analyzed with the dilation responses from the direct shear tests. Based on directional analysis...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0696
... since it may change due to the geochemical processes occurring at the asperity contacts such as mineral dissolution. It is thought that the chemical processes may be accelerated under thermal conditions. In this study, the direct shear tests under a slide-holdslide process, using artificial rock (mortar...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0677
... with increasing degree of scalping. In addition, sieving analyses were carried out before and after the direct shear tests on the 75 mm, 37.5 mm, and 19 mm scalped specimens, to assess the degree of particle breakdown on loading and shearing. The results imply that small-scale laboratory testing of aggregates...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0845
.... This problem increases the shear strength of the joint when the shear displacement of the joint exceeds a specific value and creates unwanted fractures around the intended joint plane. To solve this problem a new approach termed joint side checking (JSC) is proposed. Numerical modeling of the direct shear test...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-304
... visualization and modeling tools. In particular, until recently it was not possible to observe asperity damage without physically separating the joint specimen or explicitly modeling the development of damage during a direct shear test. interface hydraulic fracturing strength upstream oil & gas...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-391
... design bit selection hole pressure manco shale coefficient internal friction angle direct shear test ARMA 15-391 Measure of Friction during Drilling of Rocks Mahendra Shewalla AECOM, Reno, NV, USA John R. Smith Louisiana State University, Baton Rouge, LA, USA Radhey S. Sharma West Virginia...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-613
... Abstract This paper employs the Particle Flow Code in 2 dimensions (PFC 2D ) to simulate the shear behaviors of rock joints under direct shear tests. A series of rock joints and regular joints with various saw-tooth angles are investigated. The shear resistance - shear displacement...

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