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Unformatted text preview: CEEN 641 ADVANCED SOIL MECHANICS HOMEWORK ASSIGNMENT #23 1. A 4-foot wide strip footing is to be placed on the surface of a sandy stratum. The sandy stratum is characterized as having the following properties: c=0 psf; =38 ; =130 pcf; and a deep water table. If the foundation loading is 5000 psf , determine the factors of safety with respect to: 1) bearing load [neglecting settlement considerations], and 2) shear strength. The factor of safety (FS) for bearing capacity is shown in Eq. 1 and the factor of safety for shear strength, with respect to cohesion (FS c ) and friction (FS ), is shown in Eq. 2a and 2b. Recall that mobilized shear strength is the shear strength required for equilibrium. load applied Actual failure cause to Load = FS E q . 1 ) cohesion Mobilized ( ) Cohesion ( mob c c c FS = = = E q . 2 a )) tan( resistance frictional Mobilized ( )) tan( resistance Frictional ( m FS = = = Eq. 2b For consistency, use the general bearing capacity formula with Meyerhofs (1963) bearing...
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- Fall '10