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Keywords: normal stress
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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2318
... using direct shear tests under different boundary conditions, where the effects of the initial normal stress, normal stiffness, and joint surface roughness were studied. Both strain-softening and strain-hardening characteristics were observed for shear stress curves, depended on normal boundary...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1632
... & gas borehole characteristic wellbore design normal stress time response shock load rock anchor aydan shear stress interface reservoir characterization okinawa experiment load response dynamic condition ryukyu limestone ribbed surface ARMA 21 1632 Experiments on bonding...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1690
..., 2013; Keranen, 2013; Yeck et al., 2016; Yeck et al, 2017). Pore pressure and poroelastic stresses are two driving mechanisms that have been called upon to explain this phenomenon. reservoir geomechanics fault reactivation normal stress basement reservoir characterization pore pressure...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1318
... fracture characterization fracturing materials fracturing fluid displacement fracture length closure stress wang mpa propped mechanism axial stress normal stress morphology reservoir characterization complex reservoir engineering concentration tortuosity 1 microfracture plastic...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1379
... metals & mining upstream oil & gas correlation rock joint cleat aperture coal cleat characteristic shear strength coal sample aperture normal stress residual cohesion university cohesion kpa friction angle residual friction angle ARMA 21 1379 A new approach for measuring...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1817
..., so it is necessary to do in-depth research. shale gas fracture characterization hydraulic fracturing upstream oil & gas reservoir characterization complex reservoir resistance stress state stress mode horizontal in-situ stress bottom hole pressure normal stress fracture zone...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1955
..., normal stress and pore pressure control, and acoustic emission measurement. We use fine soda-lime spheres (∼50 microns) as analog material for weakly-consolidated fault gouge. We load the gouge material to its critical state with the shear load stiffness controlled by a torsion spring. The fluid...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1437
... strength experiment evaluation sandstone sample reservoir geomechanics drilling fluids and materials upstream oil & gas normal stress tensile strength mpa mechanical properties main fracture sandstone fracture compressive strength shear strength ARMA 21 1437 Ultra-deep Sandstone Rock...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1566
... on the consolidated specimens at nominal normal stresses of 500, 1000, and 1500 psi. The tests included pre- and post-failure measurement of normal and shear stiffness. The resulting peak shear stress failure envelope had a friction angle of 9 degrees (coefficient of friction of 0.16) and cohesion of 125 psi when...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1335
... roughness analysis direction reservoir characterization fracture characterization joint surface apparent dip reservoir geomechanics upstream oil & gas natural fracture roughness parameter normal stress lidar scan shear strength shear direction rock joint roughness digitization basic...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1659
... piston is used for servo control whereas in BDC the displacement output from two horizontal LVDT's positioned directly on the sheared interface are used for servo control. The frictional characteristics are studied particularly in relation to initial roughness, displacement rate, and normal stress...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1221
...-rock reaction and normal stress during acidizing process. Acid-etched pattern mainly includes surface dissolution, channel dissolution and wormhole dissolution, and the high normal stress is useful to create wormholes. 1. Introduction The deep and ultra-deep naturally fractured marine carbonate gas...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0040
... of the tests. The test results indicated only a minor variation in shear strength, at a given normal stress, across all samples. This result was surprising because sliding along clay seams is regularly observed in the underground, suggesting the clay seam interfaces should be weaker than plain salt. Post-test...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0248
... apparatus. Water was injected directly into the simulated fault through a 3 mm diameter hole drilled in the sample. During experiments, normal stress was held constant, while shear stress and water pressure varied to generate dynamic slip events. Fluid-induced slip events were found to have similar slip...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0354
... preparatory phase preceding to slip acceleration which led to identifying precursors in this mode of sliding. displacement normal stress transmitted amplitude Reservoir Characterization roughness rock joint amplitude strength peak shear strength variation experiment precursor Upstream Oil...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0299
... angles (25°,40°, 55°), two kinds of filling material(white cement, gypsum). The direct shear test is carried out under different normal stresses (30kN,50 kN,80 kN,120 kN). The results indicated that, when the normal stress is low, the peak shear strength of white cement filling and gypsum filling...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0381
... reduction in proppant settling velocity. fracturing materials fracturing fluid slickwater particle friction reducer hydraulic fracturing concentration viscosity proceedings Upstream Oil & Gas normal stress diameter shear rate HVFR Wall Effect proppant elasticity high viscosity...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0449
.... Compressional, P, and shear, S, ultrasonic waves were continuously transmitted and recorded throughout the shearing process, while Digital Image Correlation (DIC) was used to capture surface displacements. At low normal stresses, distinct maxima in the normalized P and S wave transmitted amplitudes occurred...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0401
... increasing slowly, fracturing fluid insinuate into the natural fracture which reduce the friction factor and normal stress acting on the natural fracture, causing shear slipping of natural fracture increases. In open-slipping stage: the pressure in natural fracture over the normal traction component...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1700
... demonstrate three visible slip stages from static friction to unstable slip. Variable normal stress and its response to a sudden change in shear stress was observed from the acquired pulse data. Moreover, slowly stick-slip friction dominates the injection-induced shearing in the velocity of tens...

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