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 6, Problem 6.7P
(a)
To determine
The maximum dry unit weight and the optimum moisture content.
(b)
To determine
The moist unit weight at the optimum moisture content.
(c)
To determine
The degree of saturation (S) at the optimum moisture content.
(d)
To determine
The relative compaction for the required field dry unit weight of
(e)
To determine
The range of compaction moisture contents in the field to achieve the relative compaction.
(f)
To determine
The relative density of compaction in the field.
Expert Solution & Answer
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Given: Weight of wet sand sample (Ww) = 500 g
Weight of Dry sand sample (Wd) = 490 g
Moisture content of the given sand is:
5%
4%
2%
1%
PROBLEM No. 4
A sample of dry sand having a unit weight of 17.50 kN/m³ and a
specific gravity of 2.69 is placed in the rain. During the rain, the
volume of the sample remains constant but the degree of
saturation increases to 45%.
Determine the following:
The void ratio of the sample in percent.
b. The unit weight of the sample after being in the rain.
The water content of the sample after being in the rain.
a.
С.
A certain saturated sand (S = 100%) has a moisture content of 27.9% and a specific gravity of solids of 2.61. It also has a maximum index void ratio of 0.90 and a minimum index void ratio of
0.33. Compute its relative density and classify its consistency. (Table on the right)
Solution:
Given the values of mmoisture content, specific gravity and degree of saturation, the void ratio can be estiamted as: e =
Thus the relative density is found to be Dr
=
• According to the table, the soil is classified as
%;
soil.
TABLE 3.3 CONSISTENCY OF COARSE-GRAINED
SOILS AT VARIOUS RELATIVE DENSITIES (data
from Lambe and Whitman, 1969)
Relative Density, D,(%)
0-15
15-35
35-65
65-85
85-100
Classification
Very loose
Loose
Medium denseª
Dense
Very dense
"Lambe and Whitman used the term "medium," but "medium dense" is
better because "medium" usually refers to the particle size distribution.
Chapter 6 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
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