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Keywords: roughness
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Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0686
... between fluid-injection rate and seismic moment resulting from shear reactivation of laboratory faults. Experiments are performed on granitoid cores from the UtahFORGE EGS demonstration site containing a single inclined fracture and with small-scale roughness added to the fracture surface. We inject...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0649
... ABSTRACT: Rock surface roughness influences strength, stiffness, and fluid flow dynamics. Roughness algorithms, classified as either Euclidian or fractal, have been used to quantify roughness through computing roughness indices. Because of the complexity of the microtopography of the rock...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0713
... ABSTRACT: Joint roughness strongly affects rock mass engineering properties, including shear strength and hydraulic behavior. Integrating 3D photogrammetry with unmanned aerial vehicle (UAV) technology rapidly generates 3D roughness profiles from 2D images. However, inaccuracies in roughness...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0733
... the influence of roughness degradation. Roughness degradation on joint surfaces can lead to a reduction in the asperity angle, resulting in a decrease in aperture at the critical state and a dilatancy response. In this study, we extend the aforementioned model by introducing a state parameter to account...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0759
... ABSTRACT: To investigate the impact of surface roughness on proppant crushing and its effect on fracture conductivity in Shale Gas Formations, laboratory conductivity experiments were performed on standard core columns drilled along hydraulic fractures. The morphology of proppants within...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0083
... ABSTRACT: Accurate estimation of joint roughness is critical for characterizing the mechanical and hydraulic properties of rock joints, thereby contributing to informed assessments of the rock mass classification, shear strength, and permeability estimates. The most prevalent way to quantify...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0851
... strength, seepage, roughness, waviness, and orientation. Geotechnical engineers at Rio Tinto's Bingham Canyon Mine (BCM) utilize a similar cell mapping approach (Bakken, 2023). Collecting this information on mine high walls can be time-consuming and hazardous. Safety hazards include rockfall off the high...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0220
... to be a parallel slit, while the aperture of actual fracture is not constant, and exhibits roughness. In this paper, the influences of fracture roughness on the penetration and filling behavior of the cement slurry are investigated through numerical simulation. This is achieved by simulating the grout flow...
Proceedings Papers

Paper presented at the 57th U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2023
Paper Number: ARMA-2023-0515
... flow rate fluid flow experiment experimental evaluation fracture network roughness villaquiran varga mechanism geology geological subdiscipline boundary condition stimulation psi 0 flow heterogeneity ARMA 23-0515 Experimental Evaluation of Flow Heterogeneity in Enhanced Geothermal...
Proceedings Papers

Paper presented at the 57th U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2023
Paper Number: ARMA-2023-0520
... ABSTRACT Various devices such as Barton comb, optical and laser scanner are used to record surface geometries of rock joints for roughness measurement. Measurement resolution of the used device can vary significantly depending on settings and the nature of device. Ignoring the effect...
Proceedings Papers

Paper presented at the 57th U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2023
Paper Number: ARMA-2023-0706
... ABSTRACT Fracture surface properties are essential for rock mass stability assessment. Joint surfaces can be altered by deformation processes resulting in considerable changes of joint surface morphology often classified with joint roughness coefficients. We carry out direct shear tests...
Proceedings Papers

Paper presented at the 57th U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2023
Paper Number: ARMA-2023-0014
... in underground mines, nearly all of which are subject to dynamic loading. In this paper, we report the baseline results of an ongoing study. Experimental direct shear tests were conducted on jointed specimens that were created by 3D printer to represent 3D joint roughness coefficients (JRCs) of 12 and 17...
Proceedings Papers

Paper presented at the 57th U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2023
Paper Number: ARMA-2023-0196
... progresses. The results indicate that the fracture permeability positively correlates with the shear displacement when the normal stress is relatively large. The essence of permeability evolution is the variation of the local aperture distribution. Greater fracture roughness makes it easier to form high...
Proceedings Papers

Paper presented at the 57th U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2023
Paper Number: ARMA-2023-0333
..., fractures commonly seen in fractured reservoir systems intersect each other forming complex geometric structures. Such fracture networks likely affect fluid flow behavior and solute transport. To investigate the impact of geometric characteristics of connected rough-walled fractures with an X junction shape...
Proceedings Papers

Paper presented at the 57th U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2023
Paper Number: ARMA-2023-0223
... proppant placement and its conductivity. Formation rock was cut and splitted into the API standard shape and size. Both smooth and rough fracture surface morphology quantitative data was obtained by 3D scanning technology to further evaluate the effect of fracture roughness on proppant migration...
Proceedings Papers

Paper presented at the 56th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2022
Paper Number: ARMA-2022-0202
... by the rich phyllosilicate content in the shale samples. We believe that the stability of the fracture is affected by the combination of factors such as the mineral composition, roughness of the fracture surface and the pressure of the injected fluid. 1. INTRODUCTION Seismic activity induced by fluid...
Proceedings Papers

Paper presented at the 56th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2022
Paper Number: ARMA-2022-0222
... amplitude, frequency, roughness and viscosity affect hydraulic fracture initiation. 1. INTRODUCTION The success of unconventional reservoir development is the benefits of hydraulic fracturing and horizontal wells (Rong et al.,2004; Karacan et al., 2011; Dong et al., 2019; Nguyen et al., 2020; Wang et al...
Proceedings Papers

Paper presented at the 56th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2022
Paper Number: ARMA-2022-0273
... as such is uncommon. The main property of a discontinuity is its shear strength. The shear strength has frictional parameters, such as basic friction angle and roughness, and may have a cohesion parameter. In this work, we evaluated the mechanical properties of artificial mechanical discontinuities. The artificial...

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