EVALUATION OF SHOTCRETE ROCK SUPPORT SYSTEMS IN UNDERGROUND MINES BY A NEW NON-INTRUSIVE TECHNIQUE

CIM MineSpace 2001
Ferri HASSANI, Philippe GUEVREMONT, Denis O’Donnell,
Abstract Shotcrete is quickly becoming the economical material of choice for rock support systems in underground mines throughout Canada. Although shotcrete technology has gained acceptance in the mining industry, there are some problems, which have emerged with respect to quality assessment and thickness measurement of the liner. This paper presents recent tests performed with a miniature seismic reflection device developed primarily for thickness measurement of this heterogeneous liner. Work was performed on site in an underground mine in Ontario, Canada. This paper also presents the results from laboratory tests performed on fiber reinforced and non-reinforced shotcrete panels, which were used to assess the P-wave velocity in both materials. The results of these tests were used in a second site investigation. The in-situ trials were conducted in the Stobie mine in collaboration with INCO, Sudbury personnel. The non-intrusive thickness measurement technique produced results with very good agreement with the results obtained by mine personnel with conventional methods (coring).
Keywords: support system, rapid, economic, thickness, shotecrete, miniature seismic refection, nondestructive evaluation
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