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|Underground stone mining represents an emerging sector for the U.S. mining industry. As this expansion takes mines under deeper cover and as more efficient mining methods are utilized, adequate stone pillar design methods will become more important. It is the purpose of this paper to examine current design practices and to discuss issues for safe mine layouts so that a rational first approach towards balancing the demands for increased production can be weighed against increased risk to worker safety from rib instabilities and pillar failures. Seventy-two stone mine pillar designs were examined. Pillars with width-to- height ratios below 1.5 and subjected to excessive stress levels appear more likely to fail. When width-to- height ratios fall below 1 .0, defects in the pillars, such as through-going discontinuities, can have a significant influence on stability. Discontinuity persistence, dip, material properties, and orientation are important factors controlling pillar strength. The influence of discontinuity dip, a characteristic easily identified in the field, was examined so that its presence could be accounted for in developing generalized guidelines for pillar design.|
Additional chapters/articles from the SME-ICGCM book Proceedings - 18th International Conference on Ground Control in Mining
|Pillar Collapse at Welgedacht Colliery, South Africa: A Case||Causes of Massive Directional Roof Falls in Room and Pillar||Catastrophic Collapse Of Highwall Web Pillars And Preventati||Mine Panel Collapse - Two Case Studies||Roof Geology Mapping In Underground Coal Mines||Electromagnetic Seam Wave Mapping Of Roof Rock Conditions Ac||Geological Conditions At Continuous Miner Sections; Examples||The Role Of Engineering And Geology In Analyzing Ground Cont||The Development And Use Of Risk Assessment Techniques To Ass||Time-Dependent Analysis Of Underground Opening Stability||Tekflex As A Sprayon Screen Replacement In An Underground Ha||Tunnel Deformation Monitoring "Action Levels" In Coal Mines||Skin Failure Of Roof And Rib In Underground Coal Mines||Application Of Polyurethane Injection For Rehabilitation Of||Design Considerations For Bump-Prone Longwall Mines||Design Methodology For Standing Secondary Roof Support In Lo||Modern Shield Technology: Better Than Ever But Still Not Per||Shield Monitoring To Forecast Severe Face Weightings At The||Monitoring Of Longwall Seal Behaviour For Permeability And S||Ground Control In South African Coal Mines - A U.S. Perspect||Rock Mechanics Issues In The Trona Patch||Highwall Augering In Ultra-Thick Western Coal Reserves: Uniq||Seismic Events Due To Underground Mining Activities||Control Technology For Roof Drill Operators||Resin Annulus Size Effects On Rebar Bolt Pull Strength And R||Roof Bolt Response To Shear Stress: Laboratory Analysis||Laboratory Study Of Shear Loading And Bolt Load Transfer Mec||Analysis Of Cable Bolt Performance Using Numerical Modeling||Roof Bolting Application In Longwall Mining In Indonesia And||Ground Control Design For Multiple Seam Mining Using Finite||Pillar Design Issues For Underground Stone Mines||Calibration Of The Analysis Of Longwall Pillar Stability (AL||Mine Convergence When Using Mobile Roof Supports In Pillar R||The Advance And Relieve Mining Method: A Horizontal Stress C||Localized Horizontal Stress And Its Effect On Ground Control||Prediction And Control Of Surface Subsidence Over Abandoned||Effects Of Mining On Underground Infrastructures In The Germ||Ground Deformation In The Case Of Underground Mining Of Thic||Prevention Of Time-Dependent Subsidence By Elimination Of Gr|