Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 16, Problem 16.18CTP
To determine
Find the maximum silo load that can be carried by the ring beam.
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A water tank is required to be constructed with a circular foundation having a diameter of 20m founded at a depth of 5m below the ground surface. The estimated distributed load on the foundation is 400 kN/m2. Assuming that the subsoil extends to a great depth and is isotropic and homogeneous, determine the stresses at points (i) z = 10 m, r = 0, (ii) z = 10 m, r = 10 m, (iii) z = 20 m, r = 0 and (iv) z = 20m, r = 10m, where r is the radial distance from the central axis. Use the Influence Diagram below to calculate the I. Neglect the effect of the depth of the foundation on the stresses.
A water tank is required to be constructed with a circular foundation having a diameter of 20m
founded at a depth of 2m below the ground surface. The estimated distributed load on the
foundation is 300 kN/m². Assuming that the subsoil extends to a great depth and is isotropic and
homogeneous, determine the stresses °z at points (i) z = 6m, r = 0, (ii) z = 6m, r = 10m, (iii) z =
20m, r = 0 and (iv) z = 20m, r= 10m, where r is the radial distance from the central axis. Use the
Influence Diagram below to calculate the I. Neglect the effect of the depth of the foundation on
the stresses.
Influence value l, (x100)
0.1
1.0
10
100
1.25
1.5
1.0
1
2.5
3
0.0
0.25
0.5
0.75
3
Note: Numbers on curves
indicate value of r/Ro
5
6.
-B = 2R,
mi
HR
7
10
0, = 1.9
10
Fig. 1. Influence Diagram for the Vertical Normal Stress at Various Points
Under a Uniformly Loaded Circular Area (Foster and Ahlvin, 1954)
4.
00
Depth z/Ro
Q3.
A mat foundation is shown in figure below. The design considerations are L 12 m, B
-10 m, Df 2.2 m, Q = 30 MN, x1 =2 m, x2 2 m, x3 -5.2 m, and preconsolidation pressure oe
= 180 kN/m?. Calculate the consolidation settlement:
under the center of the mat.
• Under the corner of the mat
Size of mat = BXL
Sand
Dr
y = 16.0 kN/m3
X1
Groundwater
table
Sand
Yeat = 18.0 kN/m
Clay
= 17.5 kN/m3
EYsat
e, = 0.88
C = 0.38
C; = 0.1
Chapter 16 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
Ch. 16 - Prob. 16.1PCh. 16 - A 2.0 m wide continuous foundation carries a wall...Ch. 16 - Determine the maximum column load that can be...Ch. 16 - A 2.0 m wide strip foundation is placed in sand at...Ch. 16 - A square column foundation has to carry a gross...Ch. 16 - The applied load on a shallow square foundation...Ch. 16 - A column foundation (Figure 16.23) is 3 m 2 m in...Ch. 16 - Prob. 16.8PCh. 16 - A 2 m 3 m spread foundation placed at a depth of...Ch. 16 - An eccentrically loaded foundation is shown in...
Ch. 16 - For an eccentrically loaded continuous foundation...Ch. 16 - The shallow foundation shown in Figure 16.12...Ch. 16 - A mat foundation measuring 14 m 9 m has to be...Ch. 16 - Repeat Problem 16.13 with the following: Mat...Ch. 16 - Prob. 16.15PCh. 16 - For the mat in Problem 16.15, what will be the...Ch. 16 - Prob. 16.17CTPCh. 16 - Prob. 16.18CTPCh. 16 - A 2.0 m 2.0 m square pad footing will be placed...
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