(Solution) - An arched tunnel is driven in moderately blocky and seamy -(2025 Original AI-Free Solution)

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An arched tunnel is driven in moderately blocky and seamy, wet ground at a depth of 1,970 ft. The tunnel is 14 ft wide by 11 ft 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.
(c) What is the approximate thrust capacity, in lbf, required for equilibrium?