A circular footing with a radius of r = 4.0 ft will be embedded D = 2 ft in uniform clay. The top of the foundation is at the surface. The water table is at the ground surface. Estimate the bearing capacity qult of the footing, if undrained loading conditions are the most important to consider for the clay deposit. For simplicity, assume that the initial void ratio and undrained shear strength are uniform with depth.
A circular footing with a radius of r = 4.0 ft will be embedded D = 2 ft in uniform clay. The top of the foundation is at the surface. The water table is at the ground surface. Estimate the bearing capacity qult of the footing, if undrained loading conditions are the most important to consider for the clay deposit. For simplicity, assume that the initial void ratio and undrained shear strength are uniform with depth.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
100%
initial void ratio, e0 = 1.2375
undrained shear strength, Cu = 450 pcf
Transcribed Image Text:A circular footing with a radius of r = 4.0 ft will be embedded D = 2 ft in uniform clay. The top
of the foundation is at the surface. The water table is at the ground surface.
Estimate the bearing capacity qult of the footing, if undrained loading conditions are the most
important to consider for the clay deposit. For simplicity, assume that the initial void ratio and
undrained shear strength are uniform with depth.
Ovp' = 800psf
Void Ratio
z/r, depth in radii
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
10
0.1
2
3
7
8
9
Cr = 0.07
100
1000
Effective Stress (psf)
0.2 0.3 0.4
7.0
(10.0
Cc = 0.3
8.0
9.0
5.0
6.0
10000
I, stress in percent of surface contact pressure
0.6 0.8 1.0
2
3 4 5 6 8 10
3.0
2.5
2.0
1.25
1.5
20
30 40 50 60 80 100
1.0
(0.75
0.5
2r
Note: Numbers on curvest
indicate offset distances
in radii, x/r.
KANE
X
0.25
IX q
100
9
0₂
10
FIGURE 4.10 Chart for calculating the increase in vertical stress beneath a uniformly loaded circular area.
(From NAVFAC DM-7.1, 1982, and Foster and Ahlvin, 1954; reproduced from Holtz and Kovacs, 1981.)
Expert Solution
Step 1
Given,
Footing radius, r = 4 ft
Footing depth, D = 2 ft
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