Q3: What is the ultimate capacity of 4x4 concrete pile group shown in figure 3. The pile diameter (d) = 14 in and the spacing between the piles is 3d. The piles are driven to a depth of 40 ft below grades through soil layers. The bottom of pile cap is 6 ft below grade. Indicate the failure mechanism (Block failure or individually)

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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Q3: What is the ultimate capacity of 4x4 concrete pile group shown in figure 3. The pile
diameter (d) = 14 in and the spacing between the piles is 3d. The piles are driven to a depth of 40
ft below grades through soil layers. The bottom of pile cap is 6 ft below grade. Indicate the
failure mechanism (Block failure or individually)
%3D
SAND
Y= 120 pef
0=34°
= 200 psf
%3D
=-17 ft
CLAY
Y=115 pcf
c=800 psf
a = 0.8
2=-38 ft
SILTY CLAY
Y= 125 pcf
c=1250 psf
a= 0.65
!!
2=-50 ft
Bedrock S 550 psi
Figure 3
Transcribed Image Text:Q3: What is the ultimate capacity of 4x4 concrete pile group shown in figure 3. The pile diameter (d) = 14 in and the spacing between the piles is 3d. The piles are driven to a depth of 40 ft below grades through soil layers. The bottom of pile cap is 6 ft below grade. Indicate the failure mechanism (Block failure or individually) %3D SAND Y= 120 pef 0=34° = 200 psf %3D =-17 ft CLAY Y=115 pcf c=800 psf a = 0.8 2=-38 ft SILTY CLAY Y= 125 pcf c=1250 psf a= 0.65 !! 2=-50 ft Bedrock S 550 psi Figure 3
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