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Keywords: rockmass
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Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0530
.... A synthetic mining example is presented to illustrate the impact on tunnel stress. 1 INTRODUCTION Seismic systems installed at mines record seismic waves radiated by episodes of sudden (i.e., durations on the order of fractions of a second) deformation within the rockmass. The analysis of these recorded...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0767
... ABSTRACT: Martin (1993) established the m-zero failure criterion following extensive field and laboratory testing at the Atomic Energy of Canada Limited Underground Research laboratory. The m-zero criterion is widely used for assessing excavations in rockmasses with a Geological Strength Index...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-1202
... reservoir characterization instability rocktype competence deterioration geological subdiscipline assessment figure 9 rockmass consideration mechanism guideline ARMA 24 1202 Characterizing Rock Degradability as basis for Slope Instability Mitigation for Open Pit Closure Carter, T.G. TGC...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0309
... for the gradients of this misfit function with respect to the parameters of Mohr-Coulomb failure criteria defining the intact and post-peak behaviour of the rockmass. Determining these gradients requires a single modelling simulation regardless of the number of model parameters; this affords a significant reduction...
Proceedings Papers

Paper presented at the 57th U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2023
Paper Number: ARMA-2023-0073
... ABSTRACT Field-scale rock formations (i.e. rockmasses) are composed of sections of intact rock separated by a preexisting joint network. As rockmass deforms, strain accumulates within the intact rock and slip occurs along the preexisting joints. However, the magnitude of strain within...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1205
... are introduced numerically by using Discrete Fracture Network (DFN) elements and Ubiquitous mechanical model. Two approaches are adopted to compare the initial stresses, the first approach is based on using the 3D stress gradient in a continuum rockmass without implementing the effect of discontinuities...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2163
.... Specific attention is given to methods for characterizing crown rockmasses to account for major geological structures that historically have led to adverse deformation behaviour, and in some cases to failures. 1. INTRODUCTION Although the empirical Scaled Span method for surface crown pillar stability...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0298
... rockfall support design Artificial Intelligence intersection reentry protocol rockmass stope blast firing hazard central pillar region pillar exclusion zone fractured rockmass Energy demand seismic event seismicity support system deformation ARMA 19-298 Ground control management...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-126
... in shaft geometry reduced the equilibrium ground displacements of the rockmass by nearly an order of magnitude and allowed continued shaft sinking without further liner failure. This paper documents the challenges associated with the #4 Shaft project from a rock mechanics perspective and provides...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-681
... increases and the Rate of Energy Release also increases. longhole stope geological structure dyke South Africa regional pillar seismic event excavation Reservoir Characterization rockmass production rate sengani mining seismic activity seismic energy metals & mining zvarivadza...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-730
.... reservoir geomechanics backfilled stope mechanism metals & mining Engineering backfill material geometry Reservoir Characterization stope rockmass operation agioutantis rock mass Newman Upstream Oil & Gas stress Redistribution Redistribution Aubertin mining operation excavation...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-267
... ABSTRACT: In this study, a step-by-step methodology on how to simulate sparsely to moderately fractured, highly interlocked rockmasses is demonstrated, depicting the necessary steps from the discontinuity data collection stage to the rockmass scale numerical modelling. For this purpose...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0537
... ABSTRACT: Pit slope failure can have devastating effects on safety of personnel and equipment, and affect profitability of mining operations. Discontinuities, groundwater, rockmass strength and pit geometry can cause slope failure. Also, mining activities (such as drilling and blasting) can...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-525
... in the rockmass over time, especially when looking at seismic event clusters. This paper presents results from the seismic deformation method and stress inversion analysis applied to seismic clusters from monitoring systems installed in two hard rock mines in Ontario Canada. Seismic deformation projected...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-374
... development blasts can be used to quickly evaluate source location accuracy and infer the state of rockmass conditions are given. Examples are given as to how network sensitivity can enhance the understanding of the rockmass response to mining are also presented and a case is made for 3D velocity models...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-638
... underground mining method and it enables large production rates. Despite the trend towards block cave mining, the method still faces several challenges. Improved understanding of how a rockmass responds to caving will lead to safer, more predictable and more productive cave mining operations. Combining large...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-839
... since the openings are constantly subjected to bending moments and stress redistribution. The rockmass examples from this paper can be considered as ‘‘mobile ground’’ where the combination of high ground stresses and a weak rock mass lead to the onset of closure soon after the opening has been created...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-855
... the potential development of additional flow paths and affects the fluid pressure distribution, which, in turn, affects the mechanical response via the effective stress concept. The mechanical framework uses a strain-softening, dilatant and discontinuum constitutive model for both bulk rockmass and structures...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7348
... Abstract Block size estimation is required to optimize support design, to estimate volumes for rockfall catchment systems, and is an integral part of many rockmass classification systems. The most common problem with existing methods used to determine block size is that a single...

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