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Keywords: rotation
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Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-418
... Abstract Practical case studies show that current design procedures of rockfall nets do not consider all possible impact processes in natural terrain. Barriers fail because of a high component of rotational speed of the impacting blocks or hits to corner or end fields of the barrier section...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-383
.... This paper presents an uncomplicated and convenient way to calculate stress rotations on the axis of deep, deflected boreholes in a differential in-situ stress field. Our python script allows us to quickly calculate and visualize normal and shear stresses acting on our borehole despite variations of in-situ...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-457
... as with standard flexible rockfall barriers. This type of low maintenance, passive rockfall mitigation system is increasing in popularity worldwide but no design guidelines exist. The loading mechanisms and the importance of the rotational velocity and directional behaviour of the rocks upon impact remain largely...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-122
..., which leads to the roughness increasing of the fracture surface. The absolute values of rotation angles of particles in PFC2D model increase with increasing of shear force. The particles on both sides of the fracture surface rotate at large angles, the absolute value of which are greater than 5 degree...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-188
... synchronised high-speed cameras. The objective of the set-up is to allow tracking of the blocks and fragments trajectory in 3D. Particular attention was paid to the estimation of the rotational velocities of fragments. This paper presents the preliminary tests conducted to investigate the influence...
Proceedings Papers

Paper presented at the 14th ISRM Congress, September 13–18, 2019
Paper Number: ISRM-14CONGRESS-2019-050
... deformation rotation chlorite schist stability metals & mining planar rupture crenulation cleavage importance rupture mechanism Rock Mechanics for Natural Resources and Infrastructure Development Fontoura, Rocca & Pavón Mendoza (Eds) © 2020 ISRM, ISBN 978-0-367-42284-4 Importance...
Proceedings Papers

Paper presented at the 13th ISRM International Congress of Rock Mechanics, May 10–13, 2015
Paper Number: ISRM-13CONGRESS-2015-320
... of pure rotations of arbitrary finite polyhedral blocks. It enables the engineer to judge a block's rotatability about a corner or an edge. The method is presented using a graphical and computational method. The application of the method is illustrated with an example. Introduction The kinematic...
Proceedings Papers

Paper presented at the 12th ISRM Congress, October 16–21, 2011
Paper Number: ISRM-12CONGRESS-2011-023
...Harmonising Rock Engineering and the Environment Qian & Zhou (eds) © 2012 Taylor & Francis Group, London, ISBN 978-0-415-80444-8 Rock mass instability caused by incipient block rotation A.V. Dyskin School of Civil and Resource Engineering, University of Western Australia, Australia E. Pasternak...
Proceedings Papers

Paper presented at the 12th ISRM Congress, October 16–21, 2011
Paper Number: ISRM-12CONGRESS-2011-059
... moving in translation and rotation. Any block geometry with multiple faces can be studied by partitioning the polygonal faces into simple elements. Finally, an application on a real case example and comparisons with other methods show the advantages of the new developed method and the effect...
Proceedings Papers

Paper presented at the 12th ISRM Congress, October 16–21, 2011
Paper Number: ISRM-12CONGRESS-2011-001
.... As will be shown in the next figure, the performance of UDEC-MC models with varied block sizes, nevertheless showed a significant effect of block size, due to the greater freedom for block rotations when blocks were very small. Something resembling kink-band rotation could occur. Although with 2D limitations...
Proceedings Papers

Paper presented at the 11th ISRM Congress, July 9–13, 2007
Paper Number: ISRM-11CONGRESS-2007-056
... complex reservoir strength frequency Kulatilake fracture frequency rotation block size orientation data rock mass strength procedure reservoir geomechanics Upstream Oil & Gas borehole discontinuity rock mass stress analysis cube equivalent continuum material deformability fracture...
Proceedings Papers

Paper presented at the 11th ISRM Congress, July 9–13, 2007
Paper Number: ISRM-11CONGRESS-2007-038
... the principle of superposition holds. For large displacement field, there are two theories of mechanics, i.e., classical large deformation theory (see Truesdell and Noll, 1965; Biot, 1965; Guo, 1980), in which Green strain tensor is used as strain definition while rotation tensor is defined by Finger...
Proceedings Papers

Paper presented at the 10th ISRM Congress, September 8–12, 2003
Paper Number: ISRM-10CONGRESS-2003-181
... cylinder matrix elasticity matrix Engineering Purpose specimen orthotropic anisotropy forward analysis deformation Artificial Intelligence cylinder rotation practical method Amadei anisotropy hole deformation 1053 Shin, K., Practical Method for Measuring Anisotropy of Rock Using a Hollow...
Proceedings Papers

Paper presented at the 10th ISRM Congress, September 8–12, 2003
Paper Number: ISRM-10CONGRESS-2003-223
... in micro-fracturing (shear and tensile cracks), but not in macro-failure between various loading/ unloading schemes. The second set of experiments was based on the three-point bending test and several cycles with or without rotation between cycles were applied. If the specimen was rotated by 90° or 180...
Proceedings Papers

Paper presented at the 10th ISRM Congress, September 8–12, 2003
Paper Number: ISRM-10CONGRESS-2003-220
..., or else by rotation and sliding of the blocks. This last failure mode could also lead to very low model strength. ZUSAMMENFASSUNG Dieser Bericht beschreibt die Ergebnisse von Versuchen mit Modellfelsmassen um den Einflua von unterbrochenen Rissen in ihrer Widerstandsfahigkeit zu untersuchen. Es werden...
Proceedings Papers

Paper presented at the 9th ISRM Congress, August 25–28, 1999
Paper Number: ISRM-9CONGRESS-1999-107
... ABSTRACT: When a solid element is subjected to large deformations, the components of stress will vary as a result of material rotation. These changes need to be accounted for in formulating constitutive laws that involve the rate of change of stress. To formulate the Flow Element Method (FLEM...
Proceedings Papers

Paper presented at the 9th ISRM Congress, August 25–28, 1999
Paper Number: ISRM-9CONGRESS-1999-156
... shear-flow properties for a rock joint. From the result of the shear-flow tests to confirm the efficiency of this apparatus, the rotation of the upper box was perfectly controlled during shear and the hydraulic conductivity was determined for the regions before and after peak shear stress. RÉSUMÉ...
Proceedings Papers

Paper presented at the 8th ISRM Congress, September 25–29, 1995
Paper Number: ISRM-8CONGRESS-1995-033
... ABSTRACT: A map of the in-situ major horizontal principal stress direction on- and offshore Norway reveal a stress rotation from N-S in the Barents Sea to E-W in the North Sea. The stress rotation is primarily explained by the ridge push force and the continental margin. RESUME: Une carte...
Proceedings Papers

Paper presented at the 8th ISRM Congress, September 25–29, 1995
Paper Number: ISRM-8CONGRESS-1995-038
... Upstream Oil & Gas rotation hypothetical coordinate system shear component elastic principal axis Study on determining the directions of elastic principal axes and coefficients of compliance in orthotropic rock Etude sur la direction des axes principaux elastiques et les coefficients de...
Proceedings Papers

Paper presented at the 8th ISRM Congress, September 25–29, 1995
Paper Number: ISRM-8CONGRESS-1995-083
... slope wellbore integrity point 0 bolt contribution prediction Reservoir Characterization different value analytical model shear force shear strength expression bolt orientation relation maximum bolt contribution contribution rotation joint displacement A method for the design...

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