Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Question
Chapter 3, Problem 3.11P
(a)
To determine
Calculate the moist unit weight of soil.
(b)
To determine
Calculate the moisture content.
(c)
To determine
Calculate the dry unit weight of soil.
(d)
To determine
Calculate the void ratio of soil.
(e)
To determine
Calculate the degree of saturation.
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An undisturbed soil sample was prepared for a triaxial testing. The cylindrical soil sample is 50 mm in diameter and 100 mm long. It has a mass of 360 g. After finding the mass of the entire sample, a small portion was removed and a moisture content test was performed on it. The result of the moisture content test is shown in Table 3(a). Given the specific gravity, G, is 2.70.
(i) Compute the moisture content (%) of the soil sample.
(ii) By using the soil phase diagram, determine the bulk density (kg/m³), dry density (kg/m³), void ratio, porosity (%) and degree of saturation (%) of the soil sample.
3.7 Undisturbed soil sample was collected from the field in steel Shelby tubes for
laboratory evaluation. The tube sample has a diameter of 71 mm, length of
558 mm, and a moist weight of 42.5 X 10¬3 kN. If the oven-dried weight was
37.85 × 10-3 kN, and G, = 2.69, calculate the following:
a. Moist unit weight
b. Field moisture content
c. Dry unit weight
d. Void ratio
e. Degree of saturation
For a given soil, the results of compaction test conducted in the laboratory are given in Table 1.
Table 1.
Moisture content %
Dry Unit Weight Ya(kN/m)
12
16.34
14
16.93
16
17.5
18
17.8
16.9
20
22
16.4
After compaction of the soil in the field, sand cone tests (control tests) were conducted at five
locations, the results of sand cone tests are given in Table 2.
separate
Table 2.
Moisture content (%)
Location
Moist density (kg/m')
1
15.0
2050
16.2
2070
17.3
1971
4
18.9
1988
21.3
2101
The specifications require that:
a) Yd must be at least 0.95 ya(max).
b) Moisture content w should be within +1.5% of wopt.
1) Draw (on graph paper) the compaction curve and ZAV curve. (Gs = 2.72).
2) Show for each location either it is accepted or not according to the specifications required and give
reason why?
Chapter 3 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
Ch. 3 - Prob. 3.1PCh. 3 - Prob. 3.2PCh. 3 - Prob. 3.3PCh. 3 - Prob. 3.4PCh. 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 - For a given sandy soil, emax = 0.75 and emin =...Ch. 3 - For a given sandy soil, the maximum and minimum...Ch. 3 - Prob. 3.27PCh. 3 - Prob. 3.28PCh. 3 - Prob. 3.29PCh. 3 - Prob. 3.1CTPCh. 3 - Prob. 3.2CTPCh. 3 - Prob. 3.3CTP
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