Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN: 9781337705028
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Question
Chapter 3, Problem 3.15P
(a)
To determine
Find the corrected penetration number
(b)
To determine
Find the relative density
(c)
To determine
Find the friction angle using Schmertmann’s (1975) correlation.
(d)
To determine
Find the modulus of elasticity using Kulhawy and Mayne’s (1990) correlation.
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3.15
In a site consisting of normally consolidated clean sands,
the water table is at 10 ft depth. The average unit weight of
the sand above and below the water table is 111.5 lb/ft3 and
125.0 lb/ft3, respectively. At a 25 ft depth, Nso was reported
as 26. Determine the following:
a. (N160 using Liao and Whitman's (1986) equation for CN
[Eq. (3.13)]
b. D, using Skempton's (1986) correlation [Eq. (3.28)]
c. Friction angle using Schmertmann's (1975) correlation
[Eq. (3.30)]
d. Modulus of elasticity using Kulhawy and Mayne's (1990)
correlation [Eq. (3.32)]
16. In performing water content determination, the readability of the balance for
specimen greater than 200 grams is ...
A. 0.01
B. 0.001
C. 0.1 I
D. 1
17. Which of the following clay mineral has a range of liquid limit between
55-120%?
A. Illite
B. Montmorillonite
C. Kaolinite
18. True or False. Peat and highly organic soils can have water contents up to about
500%.
A CD test was conducted on a sample of dense sand 37 mm in diameter × 77 mm long. The
cell pressure was 200 kPa. The results are shown in the table below.
Axial
displacement
(mm)
0
0.3
0.6
1.0
1.3
1.6
1.9
3.2
5.2
6.4
7.1
9.7
12.9
15.5
Axial
load
(N)
0
128.1
225.9
338.9
451.8
508.3
564.8
604.3
593.0
576.0
564.8
525.2
497.0
480.0
(a) Using the data in the table, plot the Deviatoric stress (y-axis) against axial strain (x-axis)
graph.
(b) Using the graph from (a), draw the Mohr-circle at the peak (i.e., the maximum
deviatoric stress). Determine the principal stresses as well.
(c) Provided that the sample is sand, draw a failure envelope on the Mohr circle from (b)
and determine the friction angle (p').
Chapter 3 Solutions
Principles of Foundation Engineering (MindTap Course List)
Ch. 3 - Prob. 3.1PCh. 3 - Prob. 3.2PCh. 3 - Prob. 3.3PCh. 3 - Refer to Figure P3.3. Use Eqs. (3.10) and (3.11)...Ch. 3 - Prob. 3.5PCh. 3 - Prob. 3.6PCh. 3 - Prob. 3.7PCh. 3 - Prob. 3.8PCh. 3 - Prob. 3.9PCh. 3 - Prob. 3.10P
Ch. 3 - Prob. 3.11PCh. 3 - Prob. 3.12PCh. 3 - Prob. 3.13PCh. 3 - Prob. 3.14PCh. 3 - Prob. 3.15PCh. 3 - Prob. 3.16PCh. 3 - Prob. 3.17PCh. 3 - Prob. 3.18PCh. 3 - Prob. 3.19PCh. 3 - Prob. 3.20PCh. 3 - Prob. 3.21PCh. 3 - Prob. 3.22PCh. 3 - Prob. 3.23PCh. 3 - Prob. 3.24PCh. 3 - Prob. 3.25PCh. 3 - Prob. 3.26PCh. 3 - Prob. 3.27PCh. 3 - Prob. 3.28PCh. 3 - Prob. 3.29PCh. 3 - Prob. 3.30PCh. 3 - Prob. 3.31P
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