Skip directly to search Skip directly to A to Z list Skip directly to navigation Skip directly to page options Skip directly to site content

Mining Publication: Empirical Design of Span Openings in Weak Rock based upon Support Type Employed

NOTE: This page is archived for historical purposes and is no longer being maintained or updated.

Original creation date: June 2008

Image of publication Empirical Design of Span Openings in Weak Rock based upon Support Type Employed

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.

Authors: AM Ouchi, RT Pakalnis, TM Brady

Conference Paper - June 2008

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