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Mining Publication: Empirical Design of Span Openings in Weak Rock based upon Support Type Employed
Keywords: Montana Nevada Rock mechanics Span design
This page is archived for historical purposes and is no longer being maintained or updated.
Original creation date: June 2008
Authors: AM Ouchi, RT Pakalnis, TM Brady
Conference Paper - June 2008
Download PDF Document (0.13 MB)
NIOSHTIC2 Number: 20034100
42nd U.S. Rock Mechanics Symposium/2nd U.S.-Canada Rock Mechanics Symposium, June 29 - July 2, 2008, San Francisco, California, ARMA 08-376. The American Rock Mechanics Association, 2008 Jun; :1-5
Existing empirical design tools have been developed from fair-to-good quality rock masses (RMR76 >50). This paper presents a focus of ground control research presently being conducted by the Rock Mechanics Group in the DBC Mining Department in incorporating weak rock masses (RMR76 <50) into existing empirical design relationships. An emphasis is being placed upon the updated span design curve/critical span graph originally developed at UBC. The original database has been augmented with over 450 weak rock data points from mines such as the Stillwater mine (Montana), the Eskay Creek Mine (BC) and several mines in the Carlin Trend and other parts of Nevada. The original database is comprised of spans supported with "traditional" mechanical bolting. In weak rock environments however, this type of support has been found for the most part, ineffective. This paper presents the span and weak rock RMR76 relationship for four different support categories. This work attempts to provide rock mechanic tools that will enable a mine operator to make economic decisions that will also ensure a safe working environment.
Image of publication Empirical Design of Span Openings in Weak Rock based upon Support Type EmployedConference Paper - June 2008
Download PDF Document (0.13 MB)
NIOSHTIC2 Number: 20034100
42nd U.S. Rock Mechanics Symposium/2nd U.S.-Canada Rock Mechanics Symposium, June 29 - July 2, 2008, San Francisco, California, ARMA 08-376. The American Rock Mechanics Association, 2008 Jun; :1-5
See Also
Design in Weak Rock Masses: Nevada Underground Mining Operations
Elastic and Shear Moduli of Coal Measure Rocks Derived from Basic Well Logs Using Fractal Statistics and Radial Basis Functions
Estimation of Shear Strength Using Fractals as a Measure of Rock Fracture Roughness
MULSIM/NL Application and Practitioner's Manual
MULSIM/NL Theoretical and Programmer's Manual
Numerical Modeling of Paste Sills in Underhand Cut & Fill Stopes
Pillar Mechanics of Coal Mine Bursts: A Control Strategy
Reservoir Rock Properties of Coal Measure Strata of the Lower Monongahela Group, Greene County (Southwestern Pennsylvania), from Methane Control and Production Perspectives
Rock Mechanics Investigations at the Lucky Friday Mine (In Three Parts): 1. Instrumentation of an Experimental Underhand Longwall Stope
Roof Span Design for Underground Stone Mines
Page last reviewed: November 16, 2015
Page last updated: November 16, 2015
Content source: National Institute for Occupational Safety and Health, Mining Program
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