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196 ANNAMARIA CIVIDINI AND GIANCARLO GIODA
Figure 6.19 Back calculated friction angle φ and cohesion c (I: α=1.5, II: α=1.0), and
number N of rock bolts installed per metre of tunnel, vs the distance d from the tunnel
entrance (Italian side).
and residual, φ , values of the friction angle. The dashed parts of the diagrams
r
refer to the zone close to section 6, where no reliable measurements are available.
