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Keywords: pillar strength
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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2001
... ABSTRACT: Underground stone mines in the United States generally use room-and-pillar mining method, and designing stable pillars, and knowing their behavior through the mine's life is of vital importance to avoid hazardous conditions. In the USA, empirical pillar strength equation and S-Pillar...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1238
... as the need to support the weight of the overburden strata up to the ground surface (Esterhuizen et al., 2011.) metals & mining pillar strength upstream oil & gas displacement reservoir characterization support reaction curve equilibrium point criteria convergence src correspond...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0135
... the location of damage events track the intensity/density of rock damage as the simulation progresses and relate these changes to the modelled pillar strength. The results of this synthetic rock mass pillar study provide useful insights on damage evolution and rock bridge strength characterisation in pillars...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-363
... for hard-rock pillar design. This paper presents the relevant geotechnical data related to the collapsed area and numerical model results that were used to estimate the pillar loading underneath the variable topography and compares the pillar loads to some established hard-rock pillar strength equations...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-676
... dipping faults and sympathetic joints reduce pillar strength. The failed pillars are no longer contributing to the overall mine stability but provide local support due to the residual strength. New pillar design (7m by 4m) which takes into consideration the current structural data need to be implemented...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0009
... ABSTRACT: The limitations of the current pillar strength formulas, empirical design charts, and continuum numerical modelling is that these methods do not consider discontinuity driven failure mechanisms (i.e. jointing at critical angles). Strength formulas have been very effective within...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-662
... strength. The numerical model was calibrated with Obert and Duvall empirical pillar strength equation. A multi-variant regression has been used to established relationship between the modulus of deformation of the rock mass and the pillar strength for various pillar shapes and sizes. It can be concluded...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-224
... of the mine. The situated coal between two entries is characterized as a pillar. It is noteworthy that pillars can have various geometries, but they need to carry overburden load [21, 22, 23, 24]. The pillar strength may be estimated by the Mark-Bieniawski, i.e., Eq. (9): = 0.64 + 0.54 0.18 (9) Where p...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-501
... for the mine. By so doing determining the pillar strength, pillar stress, stable span for the bords. This would form the basis for comparison between the adopted design and that drawn from the area of study. From the comparison, a conclusion can then be drawn as to whether the bad ground has rendered...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-817
... oil & gas safety natural variability lunder pillar strength strength empirical method cave mining vertical stress hard rock pillar rock pillar undercut front metals & mining reservoir characterization pillar stability reservoir geomechanics formula geometry comparative...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-679
... Abstract Estimation of pillar strength is a vital part of assessing the stability of pillars used in mines. In this paper, numerical modelling using strain softening constitutive law have been employed to estimate the strength of 32 stable St. Peter Sandstone pillar cases. The model results...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-478
... Abstract: Secondary pillar mining at the Doe Run series of underground lead mines near Viburnum Missouri often requires predictive modeling of pillar conditions to determine factors of safety. Pillar strengths used in modeling are based on empirical case studies as well as confinement theory...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-479
... of 6.2 MPa (900 psi). Models of various pillar shapes replicated Bieniawski pillar strength equation estimates for pillar width-to-height ratios up to 8. Mohr-Coulomb properties in the floor were then varied to define a boundary between heave and no-heave floor response to loading for each pillar size...
Proceedings Papers

Paper presented at the 44th U.S. Rock Mechanics Symposium and 5th U.S.-Canada Rock Mechanics Symposium, June 27–30, 2010
Paper Number: ARMA-10-410
... between Simon Fraser University, Golder Associates and the Doe Run Company. Within this approach, a technique was developed to relate the rating system to an estimation of pillar strength, via a method that considers the differing amounts of confinement within a pillar. Subsequently, the pillar strength...
Proceedings Papers

Paper presented at the 44th U.S. Rock Mechanics Symposium and 5th U.S.-Canada Rock Mechanics Symposium, June 27–30, 2010
Paper Number: ARMA-10-499
... ABSTRACT: As mining continues toward deeper reserves in the remaining western US coal fields, the evaluation of in-situ pillar strength and stability has become important at many operations in Utah, Colorado and Wyoming. Fortunately, site-specific pillar strength methods have been developed...
Proceedings Papers

Paper presented at the The 42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008
Paper Number: ARMA-08-072
... to prevent backbreaks and keep the stope hangingwall stable. These pillars provide an ideal opportunity to study the in situ behaviour of small pillars. reservoir geomechanics strength Reservoir Characterization footwall resistance metals & mining pillar strength instrumentation site...
Proceedings Papers

Paper presented at the The 42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008
Paper Number: ARMA-08-248
... ABSTRACT ABSTRACT: Coal seams sometimes have non-coal bands which can be either soft (clay, shale), leading to a reduction in pillar strength, or hard (sandstone), giving stronger pillars. Such "sandwich" pillars can also be created when the thin rock parting between two seams in close...
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-06-1129
... design procedure too far. pillar strength knowledge management Artificial Intelligence Design Procedure pillar collapse formulae pillar design formulae layout pillar strength formulae strength consideration application pillar probability experimental panel coal pillar metals...
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-06-1154
..., 77 collapsed and 245 uncollapsed cases were carefully compiled in the revised data base. Pillar strength was evaluated in the form of simple power, linear and non-linear formulae. Three probability distributions to describe the critical safety factor were evaluated, and it was concluded...
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-05-733
... strengths are compared with existing empirical approaches for determination of pillar strength. The results of the modelling demonstrate that the approach has wider application for the design of most excavations in fractured rock. INTRODUCTION Underground excavations are normally created in fractured...

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