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Keywords: persistence
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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1799
... ABSTRACT: This study combines novel and previously published data to create a new method of estimating anisotropic rock-mass strength in three dimensions that considers both the orientation and the non-persistence of multiple joint sets. Equations are developed to evaluate joint persistence...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-0016
.... They presented that the behavior of coal varied with respect to the angle between the geologic structure (such as cleats) and the loading direction (major principal stress). Kim et al. [4] modified the approach proposed by Kim et al. [5] and Kim and Kaiser [6] to understand how joint persistence affects...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0376
... characterization geostatistical approach DFN model fracture intensity bsd curve borehole block size persistence block model sandstone fluid modeling equation of state random distribution orientation tunnel mapping data excavation face validation block size distribution 1. INTRODUCTION...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2027
...-automated approach machine learning persistence parameterization Island plane assessment rockfall hazard assessment photogrammetry point cloud investigation wall strength discontinuity acquisition 1. INTRODUCTION Rockfalls present a substantial increase in their spatial and temporal...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-044
..., the results of the unconfined compressive test do not agree with the strength models of the classical strength formula because the strengths at certain orientations of cleats appear much higher than the estimation by the classical solution. The influence of non-persistent cleats on coal strength is, thus...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0552
... containing three families of discontinuities, the intact rock showing degrees of alteration of its minerals. Scenarios for analyses are evaluated in conditions of very persistent and moderately persistent discontinuities with the purpose of observing their influence on the stability of the tunnel. Three...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-563
... discontinuity persistence critical zone stability analysis orientation metals & mining bench face angle wedge fabric planar assessment software shear strength Reliability Plot friction angle BFA reliability analysis dip direction 1. INTRODUCTION The bench configuration in open pits slope...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-462
... intensity golder associate rock mass Groundwater Flow complex reservoir orientation discontinuity infrared thermography characterization fracture hydraulic fracturing persistence rock slope open pit photogrammetry intensity window mapping approach University 1. INTRODUCTION Groundwater...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-692
... that their persistence and orientation could be assessed. In this study, Cumulative Fracture Frequency (CFF) was plotted for the geotechnical drill holes to assist in potential fault identification. Any substantial increase in the cumulative fracture frequency was considered as a potential major fault which later...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-466
... and operating history that ultimately resulted in the failure of the slope. knowledge management reservoir geomechanics infrastructure Upstream Oil & Gas slope design mapping instability mechanism Reservoir Characterization persistence mechanism assessment evaluation guideline geometry...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-251
... ABSTRACT: Despite over four decades of research into rock mass and discontinuity characterization, there are still no standardized methods for field characterization of discontinuity persistence and in particular intact rock bridges. As part of an ongoing project at Simon Fraser University...
Proceedings Papers

Paper presented at the 45th U.S. Rock Mechanics / Geomechanics Symposium, June 26–29, 2011
Paper Number: ARMA-11-425
... geological patterns. ? Development of digital 3D geo-referenced multiscale base maps for direct compilation of field information (for example using tablet computers). ? Digital measurement of fracture orientation, spacing, persistence, surface roughness as well rock block and rock bridge patterns...
Proceedings Papers

Paper presented at the 43rd U.S. Rock Mechanics Symposium & 4th U.S. - Canada Rock Mechanics Symposium, June 28–July 1, 2009
Paper Number: ARMA-09-008
... recommend a slope with a FOS of less than 1.0 is acceptable, the process by which FOS is calculated needs to be understood. persistence stability analysis Engineering slope design metals & mining orientation information Upstream Oil & Gas strength geological structure stereonet...
Proceedings Papers

Paper presented at the Golden Rocks 2006, The 41st U.S. Symposium on Rock Mechanics (USRMS), June 17–21, 2006
Paper Number: ARMA-06-993
... such slope near Newhalem, Washington, from which initiated the 2003 Afternoon Creek rockslide. This paper reports on the methodology and analysis techniques used to collect the 3-D point clouds, and extract the orientation, spacing, and persistence of important discontinuity sets. It includes a discussion...
Proceedings Papers

Paper presented at the Alaska Rocks 2005, The 40th U.S. Symposium on Rock Mechanics (USRMS), June 25–29, 2005
Paper Number: ARMA-05-686
... of an equivalent strength associated with early formation of collapse mechanisms during testing. Systematic numerical experimentation and testing of cubes containing a joint with varying persistences using an elastic-plastic model (Drucker-Prager yield, associated flow rules) showed progressive failure in tests...
Proceedings Papers

Paper presented at the 19th U.S. Symposium on Rock Mechanics (USRMS), May 1–3, 1978
Paper Number: ARMA-78-0090
... persistence is insensitive to variations of the stress field and of the joint orientation relative to the stress field. Apparent persistence depends strongly however on the distribution parameters of joint spacing and length together with cohesion of intact rock. 1. INTRODUCTION Probabilistic approaches...
Proceedings Papers

Paper presented at the The 18th U.S. Symposium on Rock Mechanics (USRMS), June 22–24, 1977
Paper Number: ARMA-77-0400
... "length" is lognormal and for joint spacing exponential. Based on these conclusions, a model was developed for inferring joint set parameters and for estimating the intensity of jointing (joint surface area per volume) from outcrop data. Intensity of jointing is an indicator of persistence. 1...

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