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Unformatted text preview: The University of Texas Department of Civil Engineering CE 357  SETTLEMENT OF FOOTINGS ON SAND (Ref.: Foundation Engineering, by Peck, Hansen, and Thornburn, John Wiley and Sons.) 1. When Standard Penetration Test (SPT) Nvalues are determined at depths where the effective overburden pressure is significantly different from 1 tons/sq ft, the Nvalues should be corrected. The corrected Nvalue (N corr ) is calculated from the uncorrected Nvalue and the vertical effective stress at a given depth as follows (0 is in units of tsf): N corr = CNN where C N = 0.77log 10 (20/0) for 0 ;::: 1/4 tsf C N = 2.00  2.16'0 for 0 < 1/4 tsf Note: N values must be corrected before any of the steps below are performed. 2. When Nvalues vary with depth, average the corrected Nvalues from the base of the footing to a depth, 8 (8 = width of footing) below the base of the footing and use the average corrected Nvalue for calculating settlement. When the average corrected Nvalues so determined vary from boringtofor calculating settlement....
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 Spring '11
 Rosenblad
 Civil Engineering, Geotechnical Engineering

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