A 20 foot diameter circular shaft is planned in a massive rock Laboratory tests on core from exploration drilling show that C o 22,000 psi T o 1,200 psi 144pcf E 5 10 6 psi G 2 0 10 6 psi Depth is 3,000 ft Site measurements show that no tectonic stresses are present Determine the factors of safety with respect to failure in compression and tension

Question: A 20 foot diameter circular shaft is planned in a massive rock. Laboratory tests on core from exploration drilling show that C o = 22,000

A 20 foot diameter circular shaft is planned in a massive rock. Laboratory tests on core from exploration drilling show that

C_o = 22,000 psi T_o = 1,200 psi

γ = 144pcf E = 5 × 10⁶ psi

G = 2.0 × 10⁶ psi

Depth is 3,000 ft. Site measurements show that no tectonic stresses are present. Determine the factors of safety with respect to failure in compression and tension.

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