An 18 in diameter, 75 ft long ACIP pile is to be constructed in the following soil profile: Depth(ft) SoilDescription Unit Weight(lb/ft3) Undrained ShearStrength(lb/ft2) EffectiveFrictionAngle(deg) SPTN60 0–15 Silty sand 120   28   15–40 Clayey silt 115 1500     40–60 Sandy silt(nonplastic) 119   25   60–70 Well-gradedsand 124   32   70–90 Well-gradedsand 127   35 40 The groundwater table is at a depth of 25 ft. Using a factor of safety of 3.0, determine the ASD allowable downward load capacity.

Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter18: Pile Foundation
Section: Chapter Questions
Problem 18.14P: A steel pile (H-section; HP 360 1.491; see Table 18.1) is driven into a layer of sandstone The...
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An 18 in diameter, 75 ft long ACIP pile is to be constructed in the following soil profile:

Depth
(ft)
Soil
Description
Unit Weight
(lb/ft3)
Undrained Shear
Strength
(lb/ft2)
Effective
Friction
Angle
(deg)
SPT
N60
0–15 Silty sand 120   28  
15–40 Clayey silt 115 1500    
40–60 Sandy silt
(nonplastic)
119   25  
60–70 Well-
graded
sand
124   32  
70–90 Well-
graded
sand
127   35 40

The groundwater table is at a depth of 25 ft. Using a factor of safety of 3.0, determine the ASD allowable downward load capacity.

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