Page 332 - Rock Mechanics For Underground Mining

ROCK SUPPORT AND REINFORCEMENT

Figure 11.1 (a) Hypothetical exam-
ple of a tunnel being advanced by
full-face drill and blast methods with
blocked steel sets being installed after
each mucking cycle; (b) the radial sup-
port pressure–displacement curves for
the rock mass and the support system
(after Daemen, 1977).

Figure 11.2 Distribution near the
face, of the radial elastic displace-
ment, u i , of the circular boundary of a
tunnel of radius, r i , in a hydrostatic
stress field, p 0 , normalised with re-
spect to the plane strain displacement,
p 0 r i /2G.
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