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Keywords: roughness
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Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-060
... distance applicability of UAV-SfM photogrammetry has not yet been investigated in detail to characterize joint roughness at close range (<10 m). In this work we employ the SfM technique for the generation of 3D models of the joint surfaces from aerial images taken at a relatively short distance from...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-063
... Abstract Rock joints morphological characteristics strongly influence the shear strength dilatancy response of the discontinuity. Morphological features of rock joints are commonly identified with a roughness descriptor along standard 100 mm-length profile detected by instrumentation...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-041
... of the stochastic approach seeks to use the available roughness information from the 1D profile of a discontinuity to create a series of statistically representative 3D synthetic rock surfaces, via a rigorous random field model. The application procedure for producing such synthetic surfaces was validated at small...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-097
... surface. The initial and final block breakage has been compared against parameters including the roughness and curvature of the impacted surface, and the rock block orientation in space during free fall. We believe the results could provide useful insight into designing catchments for rock fall, as well...
Proceedings Papers

Paper presented at the ISRM European Rock Mechanics Symposium - EUROCK 2017, June 20–22, 2017
Paper Number: ISRM-EUROCK-2017-048
... Artificial Intelligence joint surface procedia engineering 191 reservoir geomechanics roughness shear displacement photogrammetry Reservoir Characterization strength pull experiment determination point cloud Upstream Oil & Gas rock joint photogrammetrically roughness...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2016, August 29–31, 2016
Paper Number: ISRM-EUROCK-2016-163
... ABSTRACT: This paper reports about the influence of normal- and shear displacements on the permeability of artificially created rock joints with different surface roughness. A new experimental setup was designed to allow linear flow on a fracture of area 150 × 150mm and also for normal...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2016, August 29–31, 2016
Paper Number: ISRM-EUROCK-2016-190
... dislocation between two surfaces of a fracture. Meanwhile, numerical models of dislocation of self-propped fractures are established under the conditions of smooth fractures and rough fractures. Based on the above research, the numerical analysis and experimental results show that self- propped width...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2016, August 29–31, 2016
Paper Number: ISRM-EUROCK-2016-055
... execution, the model will become more accurate and quantitative (especially the roughness profiling). 1 INTRODUCTION Over many years, fine sediments resulting from weathering and other surface processes could subsequently ingress to rock joints, reducing the overall shear strength of the joint surface...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2016, August 29–31, 2016
Paper Number: ISRM-EUROCK-2016-016
...Rock Mechanics and Rock Engineering: From the Past to the Future Ulusay et al. (Eds) © 2016 Taylor & Francis Group, London, ISBN 978-1-138-03265-1 Tensile strength anisotropy of Pocheon granite and roughness evaluation of its failure planes M.B. Diaz & S.G. Jung University of Science...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2016, August 29–31, 2016
Paper Number: ISRM-EUROCK-2016-047
...Rock Mechanics and Rock Engineering: From the Past to the Future Ulusay et al. (Eds) © 2016 Taylor & Francis Group, London, ISBN 978-1-138-03265-1 Effect of element surface roughness on brittle failure in hard rocks by DEM simulation S. Nakashima, T. Sakamoto & N. Shimizu Yamaguchi University...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2016, August 29–31, 2016
Paper Number: ISRM-EUROCK-2016-098
...Rock Mechanics and Rock Engineering: From the Past to the Future Ulusay et al. (Eds) © 2016 Taylor & Francis Group, London, ISBN 978-1-138-03265-1 The sliding surface roughness effect on landslides: A statistical study M. Avlonitis Department of Informatics, Ionian University, Corfu, Greece G...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - EUROCK 2015, October 7–10, 2015
Paper Number: ISRM-EUROCK-2015-192
... Abstract In this study, the possibility of measuring rock surface roughness by means of open-source photogrammetric methods was investigated. With simple commercially available digital cameras, samples of varying roughness were measured. As a reference, the samples were also measured...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - EUROCK 2015, October 7–10, 2015
Paper Number: ISRM-EUROCK-2015-078
... ABSTRACT: Some limitations of the models of limit equilibrium of forces for rock mass joints are discussed here, especially the exclusive use of dimensionless geometric parameters of roughness. A new limit equilibrium model of strain energies for rock joints, which allows the integration together...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - EUROCK 2015, October 7–10, 2015
Paper Number: ISRM-EUROCK-2015-085
... Abstract Numerous measurement and characterization methods have been developed over the past decades to quantify the roughness of rock joints. The characterization methods traditionally consider a 2D linear trace and are often limited to the laboratory scale. In this research, 3D point clouds...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - EUROCK 2015, October 7–10, 2015
Paper Number: ISRM-EUROCK-2015-087
... conducted on discontinuities in shale and sandstones. These were partly weathered and sometimes coated by coal. Friction angles range from 10° for coal-coated joints in sandstone to 40° clean joints in sandstone. The discontinuities were scanned with a 3D laser scanner for estimating the surface roughness...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - EUROCK 2014, May 27–29, 2014
Paper Number: ISRM-EUROCK-2014-124
..., it is necessary to gain knowledge about the shear strength of these joints.The shear strength of rock joints is influ- enced by several factors such as the surface roughness, the compressive strength of the joint surface, the nor- mal stress, the degree of weathering, the matedness, the infilling material...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - EUROCK 2014, May 27–29, 2014
Paper Number: ISRM-EUROCK-2014-129
...Rock Engineering and Rock Mechanics: Structures in and on Rock Masses Alejano, Perucho, Olalla & Jiménez (Eds) © 2014 Taylor & Francis Group, London, 978-1-138-00149-7 CFD-DEM simulations for injection of cement-based grout the effect of rock fracture roughness S. Sakakibara & T. Koyama...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - EUROCK 2014, May 27–29, 2014
Paper Number: ISRM-EUROCK-2014-039
... and Mineral Resources Engineering, Norwegian University of Science and Technology, Trondheim, Norway ABSTRACT: The apparent friction angle of a rock joint, , is the sum of two parts: the basic friction angle, b, and the roughness angle, i. b is decided by the mineralogy of the rock; It is usually measured...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - EUROCK 2014, May 27–29, 2014
Paper Number: ISRM-EUROCK-2014-001
.... With linear Mohr-Coulomb this is not a very enlightening exercise. The very small circles in Figure 6 represent the peak strength of fractures, and the dotted curved envelope, drawn into the inadmissible area for reasons of clar- ity, was used to demonstrate the maximum empirical strength of (rough) rock...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - EUROCK 2014, May 27–29, 2014
Paper Number: ISRM-EUROCK-2014-075
... Abstract From a physical perspective, a joint experiences fracturing processes that affect the rock at both microscopic and macroscopic levels. The result is a behaviour that follows a fractal structure. In the first place, for saw-tooth roughness profiles, the use of the triadic Koch curve...

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