Foundation Design: Principles and Practices (3rd Edition)
3rd Edition
ISBN: 9780133411898
Author: Donald P. Coduto, William A. Kitch, Man-chu Ronald Yeung
Publisher: PEARSON
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Chapter 3, Problem 3.8QPP
A vertical load of 20 k is applied to a
a. Compute the induced vertical stress,
b. Compute the induced vertical stress,
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6. A concentrated load of 1500 KN is applied at the ground surface at point A whose coordinate is
(0,0,0).
a. Determine the vertical stress, in KN at a point 2.5 m directly below A.
b. Determine the vertical stress, in KN at a point whose coordinate is (1.5, 0, 2.5).
C.
Determine the vertical stress, in KN at a point whose coordinate is (1.5, 2, 2.5).
A vertical load of 320 kips is applied to a 5ft by 5ft area at the ground surface that is level in the figure on the right.
a. Compute the induced vertical stress, Az, at a point 3 ft below the corner of this square loaded area using B's equation.
b. Compute the induced vertical stress, Aoz, at a point 3 ft below the center of this square loaded area using the chart.
c. Compute the average induced vertical stress, Aoz, at a depth of 3 ft below this square loaded area using the 1:2 method.
Solution:
• Preliminary Calculations:
1). Area of the footing: A =
●
2). Bearing pressure at the bottom of the footing: q =
Calculation of induced stress:
a). Below the corner using the B's equation:
1). m =
2). n =
3). Io =
2).
4). Az,corner
psf;
b). Below the center using the chart (or the square footing equation):
Zf
1). //
B
B
||
3). Io =
=
=
4). Az, center
c). Averaged induced streess below the footing:
1). Io:
=
ft²;
2). Az, average
||
psf;
psf;
psf;
Silty Sand:
(SM)
Clayey Silt
(ML) ▼
A
12 ft.…
A circular tank full of water, the tank imposes a uniformly distributed load of 2000 lb/ft2 at the ground surface.
The radius of the circular area is 10 ft, the soil unit weight is y=110 lb/fť. Compute the following:
a) The vertical stress at a point 20 ft below the center of the circular area
b) The vertical stress at 20 ft below the ground surface at a horizontal distance of 5 ft from the center of
the circular tank.
c) The vertical stress at 20 ft below the edge of the circular area
d) The vertical stress at 20 ft below the ground surface at a horizontal distance of 18 ft from the center of
the circular area.
Chapter 3 Solutions
Foundation Design: Principles and Practices (3rd Edition)
Ch. 3 - Explain the difference between moisture content...Ch. 3 - A certain saturated sand has a moisture content...Ch. 3 - Consider a soil that is being placed as a fill and...Ch. 3 - A sample of soil has a volume of and a weight of...Ch. 3 - A site is underlain by a soil that has a unit...Ch. 3 - The sub-surface profile at a certain site is shown...Ch. 3 - A vertical load of 300 kN is applied to a area at...Ch. 3 - A vertical load of 20 k is applied to a area at...Ch. 3 - 3m3m footing is to be built on the surface of a 15...Ch. 3 - A 3 ft square footing carries a sustained load of...
Ch. 3 - A 2m thick fill is to be placed on the soil shown...Ch. 3 - Estimate the effective friction angle of the...Ch. 3 - Explain the difference between the drained...Ch. 3 - A soil has c=5 kPa and =32. The effective stress...Ch. 3 - A footing with an embedment of 2 m is embedded in...Ch. 3 - Prob. 3.16QPPCh. 3 - Prob. 3.17QPPCh. 3 - A 9 ft thick fill is to be placed on the soil...
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