Page 141 - Rock Mechanics For Underground Mining
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SHEAR BEHAVIOUR OF DISCONTINUITIES
30
20
10
Figure 4.38 Sliding of smooth
quartzite surfaces under various con-
0 10 20 30 40
ditions (after Jaeger and Rosengren,
1969).
Figure 4.39 Results of a direct
shear test on a 127 mm × 152 mm
graphite-coated joint, carried out at
a constant normal force of 28.9 kN.
(a) Shear force–shear displacement
curves; (b) surface profile contours be-
fore testing (mm); (c) relative posi-
tions on a particular cross section after
25 mm of sliding (after Jaeger, 1971).
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