Failure mechanism of resin anchored rebar in potash


D. Neely
Agrium Mine, Vanscoy, Saskatchewan, Canada

D. Milne and L. R. Feldman
University of Saskatchewan, Saskatoon, Saskatchewan, Canada

C. Smith
Potash Corporation of Saskatchewan Inc., Saskatoon, Saskatchewan, Canada
Abstract Reinforcing bar (rebar) anchored with resin is commonly used for rock support in hard and soft rock mining. The average bond strength (the load that the support can sustain for a length of bond to the rock) is dependent on in-situ rock properties and environment; this metric allows mine engineers to select the appropriate length and patterned spacing of installation for the support. When rebar is placed in weak, soft material such as potash, the average bond strength tends to be lower than for a typical hard rock installation. This research, aimed at determining the failure mechanism by which the support fails in soft rock applications, might lead to methods to improve bond strength and better calculate installed support capacity. This paper reports on field research conducted at a potash mine in Saskatchewan, Canada and analyzes the failure mechanism for this type of support.
Keywords: Bond strength, Potash, Reinforcing bar (rebar), Support capacity
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