# Handout21 - Department o f Civil Engineering Example...

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N values 2ft Depth (ft) from "poorest" borehole (blows/ft) a'v (tsf) CN Nl (adjusted blows/ft) 2 6 0.10 1.77 10.6 "1= 100 pcf 8 ft 4 6 9 10 0.20 0.30 1.54 1.40 13.9 14.0 _S' _______________ . 8 10 21 15 } Neglect because > B below footing Department of Civil Engineering Example: Settlement of Footing on Sand A 4-ft wide square footing is embedded 2 ft below the ground surface. The footing will carry a column load of 50 kips. The site is composed of sand with a water table at a depth of 10 ft. The N- value profile from SPT testing at the site is presented below. Calculate the settlement of the center of the footing. 1. With the water table at a depth of 10 ft: Use: Nt = 10.6 + 13.9 + 14.0 12.8 = 13 3 Also: C = 0.5 + 0.5 Dw = 0.5 + 0.5 (10) =1.33; but C ~ 1.0 => use C w = 1.0 w Df+B 2+4 w . q lin. = 0.11 (13) C w = 0.11 * 13 * 1.0 = 1.43 tsf 50 qapplied = 4x 4 = 3.125 ksf ==
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