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1 <br />I' <br />'' <br />I <br />~1~ <br />~ oa <br />pa <br />ft <br />~{ 15 <br />1 <br />1i <br />i t' 18 <br />' k 20 <br />'. <br />'~ <br />1 <br />1 <br />1 <br />TABLE N0. 3 <br />Factors of Safety by Layer and Support Condition* <br />Friction Effects Onl <br />Bolts ten- Bolts ten-~ <br />sioned to sioned to <br />13,600 psi 3400 psi <br />(5000(1) (1500!') <br />n Layer Unrein- <br />,) No. forced <br />3 1,47 <br />2 1.56 <br />1 0.36 <br />3 1.37 <br />2 1.08 <br />1 0.25 <br />3 1.11 <br />2 0.88 <br />1 0.20 <br />2.63 <br />2.08 <br />0.47 <br />1.77 <br />1.41 <br />0.32 <br />I.42 <br />1.12 <br />0.26 <br />2.34 <br />1.85 <br />0.42 <br />1.60 <br />1.26 <br />0.29 <br />1.28 <br />I.02 <br />0.23 <br />Suspension <br />Effects <br />Onl <br />No Post <br />tensioning <br />1.45 <br />2.29 <br />2.50 <br />1.01 <br />1.59 <br />1.74 <br />0.81 <br />1.29 <br />1.41 <br />Combined Friction and <br />Suspension Effects . <br />Bolts ten- Bolts ten- <br />sioned to sioned to <br />13,600 psi 3400 psi <br />(60001)) (1500;1) <br />1.93 1.72 <br />3.06 2.72 <br />3.35 2.99 <br />1.30 1.17 <br />2.06 1.86 <br />2.26 2.03 <br />1.04 0.94 <br />1.64 1.49 <br />1.80 1.63 <br />*Assumes Piodulus of Rupture for shale [o be approximately 600 psi (unverified). <br />