Question: An arched tunnel is driven in moderately blocky and seamy, wet ground at a depth of 2,830 ft where rock properties are: Co = 14,300

An arched tunnel is driven in moderately blocky and seamy, wet ground at a depth of 2,830 ft where rock properties are: Co = 14,300 psi, To = 1,430 psi, E = 4.25 (106) psi, G = 1.8 (106) psi, γ = 156pcf. The tunnel is 14 ft wide by 17 ft high; the back arch is semi-circular. Specify a suitable steel set size (web depth, flange width, weight per foot), set spacing and maximum blocking point spacing for these conditions.

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