Page 343 - Rock Mechanics For Underground Mining

PRE-REINFORCEMENT

Figure 11.11 Pre-reinforcement at
Campbell Mine, Canda: (a) cut-and-
fill back reinforcement; (b) longhole
open stoping hangingwall reinforce-
ment; (c) longhole open stoping hang-
ingwall reinforcement from a hang-
ingwall drift (after Bourchier et al.,
1992).

and Thompson, 1993, Hoek et al., 1995, Hutchinson and Diederichs, 1996, Windsor,
1997, 2001). As a result, these problems have now been largely overcome.
Pre-reinforcement may also be used to good effect in permanent and infrastructure
excavations. Several examples are given by Hoek et al. (1995). Figure 11.12 illustrates
the use of grouted reinforcing bars to pre-reinforce a drawpoint. For drawpoints
that may be heavily loaded and subject to wear, their continued stability is vitally
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