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Keywords: specimen
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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1566
... 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-2021-1570
... zone experiment brittleness index reservoir characterization ductile bi strain irwin length upstream oil & gas strength fracture toughness brittleness poisson friction angle specimen bi mineralogy distinction mineralogy tensile strength compressive strength nominally ARMA 21...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2089
... to strain (position) control. Sample is loaded at constant rate until failure, and Following ASTM-D7012, the specimen is tested at a then unloaded. The peak stress condition is calculated constant rate (3.3 × 10!" m/sec) so that specimen fails in from load cell force measurement and sample diameter...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1222
.... In this study, a series of triaxial compression tests were performed to investigate fracturing in cylindrical specimens of rock containing an inner diameter of backfill (referred to as RB). Stress-strain results showed a very unique post-peak stress-strain behavior due to progressive shear and tensile...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1311
... proportion. After a period of curing, specimens with weak strength can be obtained. Some other binders like alkaline silica gel have also been used to replicate sandstones (den Brok et al., 1997; David et al., 1998). The gel was coated on the sand grains, and then its solvent was burned off. The mixture...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1436
... occurred first at the top of the specimen, where the load was applied, and then progressed along the joint as the shear stress increased. This process was consistent with the precursors i.e., precursors were first recorded near the top and later at the center and finally at the bottom of the specimen...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1919
... petroleum product specimen apparatus west conshohocken conshohocken test jar liquidity room pressure test apparatus oil sand upstream oil & gas viscosity procedure high pressure standard test method ARMA 21 1919 Investigation on Liquidity of Oil Sand Bitumen Under Reservoir Temperatures...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1965
.... This study focuses on the analysis and interpretation of the micro-cracking processes that occur in rocks under different levels of constant axial strain through systematic stress relaxation experiments. Prismatic Barre granite specimens with two pre-existing flaws were subjected to unconfined compression...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2121
... coincided with an increase in AE rate. However, released energy and onset of inelastic behavior were influenced by the pore fluid. Presence of oil in the pores did not affect the AE behavior. Earlier onset of recorded AE activity in water-saturated compared to dry and oil-filled specimens is explained...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2138
...; however, single-crystal rock salt's behavior under cyclic loading is yet under-explored. This paper attempts to address this gap using cyclic and quasi-static loading-unloading tests on natural single-crystal specimens. Additionally, single-crystal rock salt's mechanical response is rather anisotropic...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2156
... of tunnel wall convergence with time. Burger's model and Mohr-Coulomb's parameters are determined from unconfined compressive strength tests, triaxial tests, and creep tests on the cylindrical specimen of the host rock. The results of the proposed solution are compared with tunnel convergence data from...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2020
... loading frame that can accommodate large specimens, radial fluid flow and sand mass measurement capabilities. Such a system was recently manufactured by MTS Systems on a concept design by SINTEF. The TTRX (True Triaxial) test system has been operational at SINTEF for a few years and has been producing...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2023
... for chalk influx and quantify the dominant effects. Hollow cylinder experiments on chalk specimens with wormholes were tested and the results were compared with specimens without wormholes. The tests results reveal that the wormholes are effective in delaying breakout formation and chalk influx despite...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2031
... granite knowledge single-station observation waveform velocity model specimen sensor strain distribution locating acoustic emission experiment arrival time research letter ARMA 21 2031 Machine Learning for Locating Acoustic Emissions from Single-Station Observations of Brittle Cracking...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2318
... shear strength, and bolt failure mode [2]. Wang et al. evaluated the acoustic emission counts and characteristics of bolted rock-like joint specimens with different roughness and bolt elongation rates [7]. Wu et al. conducted a series of direct shear tests on six standard roughness profile joints...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1119
... borehole reservoir characterization upstream oil & gas rise time radial fracture base case specimen tensile strength fragment fracture peak pressure petroleum engineer complex reservoir bond break particle dem-continuum mechanics modeling symposium mechanics association ARMA-21-1119...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1197
... results from two specimens that were extracted from core from the site. The first is from a Yates amphibolite and rhyolite contact (YA02-01). The second is a weak natural fracture from the rhyolite (YA02-05). Results show that the initial permeability of the weak rhyolite fracture was around 0.3 mD...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1213
... fracture sandstone modeling & simulation fracture characterization fracture length hydraulic fracturing treatment hydraulic fracturing reservoir geomechanics upstream oil & gas structural geology dfn method outcrop sample bedinan fm bedinan formation south east part specimen...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1347
... ABSTRACT: Circular disc specimens under indirect tensile testing often fail abruptly, especially in brittle materials like rock and concrete. Despite widespread popularity, such testing methodologies are incapable of capturing snapback (or class II) behavior of circular disc specimens made...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1446
... were automatically segmented into the rock part, grout part, and void part using a deep learning algorithm. The automatic segmentation method successfully identified the rock part and the grout part of the mudstone specimen with a simple planar fracture, although the range in CT values of the rock part...

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