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Keywords: discontinuity
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Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-046
...THE FAILURE SIMULATION OF ROCK MASSES BY DISCONTINUOUS DEFORMATION ANALYSIS Zhou Weiyuan1, Qiang Tianchi2 and Yang Ruoqiong3 ABSTRACT Di sc ont inu ou s Defo rmati on An aly sis ( DDA) i s a n ove l met hod u sed to a nal yze t he mot io nal la w for di sc ont inu ou s, joi nt ed roc k mas ses . Th...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-026
... to effect the greasing and sheathing of selected sections of pre-cut strand tendons, which although discontinuous as in operation, had distinct advantage in avoidance of application followed by removal (Photo 3). The development of these refined systems did in the view of certain specialist contractors make...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-033
.... Specifically, geometric, mechanical and geometric - mechanical models are discussed with emphasis on the latter. When considering slope stability, as well as rock mass behavior in general, it is very important to capture the mechanisms by which the discontinuities interact with each other. This interaction...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-035
... is controlled by the geometrical shape of the intact rock pieces as well as the condition of the surfaces separating the pieces. Angular rock pieces with clean, rough discontinuity surfaces will result in a much stronger rock mass than Normal stress n MPa 0.0 0.2 0.4 0.6 0.8 1.0 1.2 Sh ea r s tre ng th M Pa...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-207
... of discontinuous rock masses. The study is conducted by assuming that the fracture density and the length of cracks, contained in a rock mass, depend on a negative exponential statistical distribution. Compressive tests are simulated on rock volumes containing open and closed flat cracks through a numerical...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-454
..., a Quaternary tectonics characterized by mostly vertical movements caused the development of several sets of discontinuities in the rocks (DÕAngelo et al., 1979); additional discontinuity systems are, on the other hand, related to gravitational deformations, due to the superimposition of the calcarenitic...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-459
... leads in a rock mass quality underestimation, which mainly due to the rating adjustment for discontinuity orientations as especially proposed for rock slopes. The case records evaluation indicate that the rock mass rating without taking into account the discontinuities adjustment give a more realistic...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-468
..., and it was possible to correlate the folding observed on the three sites with the regional scale folding. Please note that all discontinuity orientations given are dip/azimuth, and are given as magnetic bearings. Artilligan The rock at Artilligan consists of inter-layered strong to weak up to 3.0m thick bands of mica...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-429
... ABSTRACT: A "step-path" method for determining the statistical shear strength along critical failure paths through jointed rock slopes is reviewed. The computed shear strength is a function of both sliding and "stepping-up" along sets of suitably orientated geological discontinuities within...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-455
...GENERATING DISCONTINUITY ORIENTATION DATA FOR USE IN PROBABILISTIC MODELS FOR MODELLING EXCAVATIONS IN ROCK. Anthony (Tony) G. Meyers1 and Stephen D. Priest2 ABSTRACT Proprietary probabilistic software generally requires discontinuity orientation to be defined according to two distributions, one...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-425
... Reservoir Characterization stability assessment cliff face investigation unstable rhyolite cliff discontinuity plane rhyolite cliff loosening terrestrial photogrammetry structural geology unstable part discontinuity rock mass remedial measure STABILITY ASSESSMENT OF AN UNSTABLE RHYOLITE...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-523
... into the UDEC model. reverse scarp History flexural excavation metals & mining Tasmania centre pit schist western wall displacement discontinuity sequence North Pit slope angle Horizontal Drainhole savage river foliation shear Orebody ANALYSIS OF FLEXURAL TOPPLING AT AUSTRALIAN...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-435
... in the modeling of the physical process. relation probability theory discontinuity zadeh Engineering geotechnical engineering water pressure Artificial Intelligence rock bearing strength modeling information application excessive settlement fuzzy logic clay layer fuzzy characterization model...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-475
...SHEAR STRENGTH EQUATION FOR ROCK JOINTS, BASED ON 3-D SURFACE CHARACTERIZATION Giovanni Grasselli1, Peter Egger2 ABSTRACT Rock mass is heterogeneous, anisotropic and discontinuous. When civil engineering structures like dams are founded on rock, they transmit normal and shear stresses to the joints...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-481
... and crags, ledges and ridges interrupt the slope profile. To the West of 1996 landslide area, intensely fractured rock masses with open discontinuities and large boulders sitting on the bedrock were surveyed. From the geological point of view, the studied area belongs to the Dora-Maira Massif, continental...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-564
... of width, 48 m of height and more than 80 m of length in the Candoglia quarry). structural geology cavern marble excavation Reservoir Characterization strength stability analysis stability pillar block recovery Upstream Oil & Gas dimension discontinuity rock mass reservoir...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-466
... and friction angle. However, cohesion may be highly variable in the deposits and it deteriorates on loading, leading to precarious conditions of stability. Sub-vertical cuts in pozzolana may also collapse due to the presence of discontinuities hidden in the rock mass, such as tension cracks at the top...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-427
... the stability of rock cuttings. The basic theory of RMR is based on the statistical analysis of field observa-tions of rock discontinuities, ground water conditions, and laboratory tests for rock strength parameters. These rock mass classifications are usually applied and used with observational methods...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-516
... methods such as the finite element method (FEM) with joint or interface element by, among others, Goodman et al. (1968), distinct element method (DEM) by Cundall (1971) and discontinuities deformation analysis (DDA) by Shi (1988) can be accounted for. In spite of all these techniques, it is difficult...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-437
... ABSTRACT: Lithological units have been classified geotechnically with mechanical tests and discontinuity measurements in the Rotowaro coal mine open pits, New Zealand. Using these measurements slope stability probability classifications (SSPC) have been quantified based on an adaption...

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