163_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

163_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 - of...

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DF42 Drilled Shaft Side Shear: o drilling open hole decreases insilu (K o ) lateral stress around shaft o placing concrete increases insitu lateral stress (concrete is fluid with y = 150 pet) o methods are approximate based on stalic tests and observation o be careful about time of slurry contact and seepage into shaft! o whereMcr=--adhesion factor (soil on cast-in-pJace concrete) a.=.0.5.? fOLCu 5-3.0"'sl (150 kPa) a =·0,45 lor c, ~-5'0 ksJ,(250 kPa) (inlerpolale a lor 3.0 ksl < c, < 5.0 ksl) also «"=0 lor-length 01 5 (1~5.m)-aH1ead
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Unformatted text preview: of shaft a-~O for-length of B-just above-shaft loe (orjos above1op-of-beU) o Coheslon!ess Soils (O'Neill & Reese, 1999 FHWA manual) where ~=1.5-0.135fiJt or ~=1.5-0.245~z,m 0.25 5 ~ 5 1.20 (limits) o Gravels (Rollins, Clayton, Mikesell, 1997) where ~ = 3.4e-<>·026' for z in ft 0.25 5 ~ 5 3.00 (Iimils) or p:= 3.4e-()085z for z in m o Rock (McVay, 1997) where crt = split tensile strength of rock core cr c = unconfined compressive strength of rock core where Ree = recovery = (core length recovered I core run)...
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