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108_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011

108_CEG 4012 Notes Fall 2011 CEG 4012 Notes Fall 2011 -...

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BC23 o Three CPT methods from Schmertmann's (1975, 1978) work at UF First calculate the average Cit in kgf/cm 2 over the depth range 0-1.5B below the footing. (Bowles would calculate Cic over the depth range 0.5B-1.1 B) (1 bar = 1.019 kgf/cm 2 = 100 kPa = 1.044 tsf) Method 1: Calculate Ny = N q = 1.25 Cic Method 2: Back figure ep from Ny or N q above and use ep with general BC equation Method 3: Equations based on work by Awkati (unpublished but oft repeated, 1970) valid for Df ~ 1.5 ft + B/2 if B < 3 ft and Dr ~ 4 ft if B ~ 3 ft cohesionless soils: qu = 28 - 0.0052 (300 - qc' kgf/cm 2 ) 1.5 strip footing (sands) qu = 48 - 0.0090 (300 - Cic' kgf/cm 2 ) 1.5 square footing cohesive soils (clays): qu = 2 + 0.28qc' kgf/cm 2 strip footing qu = 5 + 0.34Cic' kgf/cm 2 square footing The determination
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Unformatted text preview: ...lIow foundltfon from the It8tJc cone'. burfng Clpeclty. laid Awbtl: February, 1970 (unpublilhed) &O.---"'T""-'-T"---r---,r---T""'"-~--r--_,. .-___y-___,r_-,._-""T'""-_-~-_ CIu . (tsfl 10 ~ • Cone Point Bearing Capacity qu . . Ultimate Capacity of Footings 4Or---. .......--r-. ...,.----,r-----, or df ~ 1.5' + ~ when B, the minimum width of the footing I. less than 3 feet. df ~4' when, B, the minimum width of the footing I. more than 3 faat. Note: These charts are valid for a footing with an embedment,df,deflned as 10 o 0L.--. .L 10--L.--. .L--. ...a. ..---:!&O 30 CIu (tsf) 20 ( ~...
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