An arched tunnel is driven in moderately blocky and seamy, wet ground at a depth of 297
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An arched tunnel is driven in moderately blocky and seamy, wet ground at a depth of 297 m. The tunnel is 5.51 m wide by 61.4 m high; the back arch is semi-circular.
(a) Specify a suitable steel set size (web depth, flange width, weight per foot), set spacing and maximum blocking point spacing for these conditions.
(b) Explain how one would handle a relatively high side pressure that may develop crossing a fault zone.
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