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Keywords: roughness
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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1680
... failure surface, and the root mean square was used to calculate scanned point cloud data; a simpler index for calculating roughness based on area variation was established; the surface crack morphology of the sample was drawn by high-resolution photos, and the crack complexity was quantitatively described...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1767
... ABSTRACT: Anisotropy in the mechanical properties of rock is often attributed to bedding and mineral texture. Here, we use 3D printed synthetic rock to show that, in addition to bedding layers, mineral fabric orientation governs sample strength, surface roughness and fracture path under mixed...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1326
... Abstract Currently, acid etching and conductivity experiments mostly use smooth rock samples to simulate the formation of acid fractures. There are few reports on the influence of fracture rough morphology on acid etching behavior and conductivity. In this paper, digital carving technology...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1335
... Abstract The present paper focuses on evaluation of existing methods for digitization and quantification of joint roughness. Repeated lidar scans of a number of natural rock joints were registered using Cloud Compare and MATLAB and were then interpolated onto a regular grid for averaging...
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 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0316
... but no consensus on the determination or on its influence parameters exists. Thus, an experimental study was developed and new insights on the apparent cohesion influence parameters (roughness, interlocking, material mechanical properties, contact type and normal load) were found. 64 direct shear tests were...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0352
... and this validation step further solidifies the robustness of the proposed model. Upstream Oil & Gas flow in porous media complex reservoir Wang permeability model pore diameter roughness stress path nanopore flow regime pore size distribution Fluid Dynamics shale Marcellus Shale variation...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0115
... hosted clusters of recorded production induced seismic events. The interpreted fault geometries are further analyzed utilizing spectral analysis and fractal theory. We identify roughness anisotropy from the slip-parallel and slip-normal power spectra, which indicate less degree of anisotropy in Hurst...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0209
... ABSTRACT: Systematic calculations have been done in order to analyze the response of a medium with a hilly surface to explosions created below the ground surface when a cavity can be present. Random surfaces with a given correlation function are studied. The influence of the roughness...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0307
... method US government contour hole fracture plane formation hydraulic fracturing roughness crack propagation application perimeter holmberg method blast design method damage zone 1. INTRODUCTION Ground fall has been considered as a major safety issue in underground excavations in the mining...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0354
... limestone rock specimens, there is still more research needed for evaluation of causes and types of precursors on rock joints with rough contacting surfaces. We present results from novel ultrasonic compressional (P-) and shear (S-) wave propagation measurements in which sandstone rock joints with a non...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1700
.... hydraulic fracturing Reservoir Characterization roughness normal stress fracture characterization static friction friction variation Upstream Oil & Gas experiment shear slip variable normal stress slow slip slip velocity shear stress injection fluid injection slip evolution specimen...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1757
... rock (UCS). However, this approach neglects the influence of other important aspects such as the roughness at the pile-rock interface. This work examines the socket roughness effect on side shear resistance of rock-socketed piles, using DEM 3D numerical models of rock-socketed piles with different...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1994
... ABSTRACT: Joint roughness directly affects the behaviour of discontinuities at the laboratory scale and the rockmass at excavation scales. As large infrastructure projects (e.g. deep base tunnels for transportation, large open pit and underground mines with complex geometries, and deep...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2143
... planes with some branches. For both water and SC-CO2 fracturing, higher the confining pressure, higher the breakdown pressure and lower the tortuosity and roughness of the main fractures. Meanwhile, compared with the water fracturing, it is implied that the breakdown pressure of SC-CO2 is generally lower...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2125
... ABSTRACT: Fracture surface features and proppant are the two essential factors controlling hydraulic fracture conductivity. In this work, we measured the effect of fracture surface and proppant parameters on fracture conductivity based on duplicated rough fracture surfaces. To simulate...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2027
... methods for rapid and accurate identification of discontinuity parameters subjectively and even from inaccessible areas of the rockfall body. Artificial Intelligence strength Reservoir Characterization modification orientation Upstream Oil & Gas hazard assessment roughness novel semi...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2109
... ABSTRACT: Our experiments investigate the role of roughness in fracture permeability and frictional behavior using artificial fractures with controlled roughness. The results show that (1) Rougher surfaces indicate higher frictional stability and frictional strength due to the presence...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2183
... engineering approach to mimic processes or parameters distributions are used. geothermal reservoir pore pressure candela injection-induced seismicity Reservoir Characterization fault roughness heterogeneity rupture event Upstream Oil & Gas friction normal stress Geophy seismicity...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2118
... ABSTRACT: Subsurface fluid injection can disturb the effective stress regime by elevating pore pressure and potentially reactivate faults and fractures. Laboratory studies indicate that fracture rheology and permeability in such reactivation events are linked to the roughness of the fracture...

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