
Concept explainers
(a)
Find the moist unit weight of the soil sample.
(a)

Answer to Problem 3.4P
The moist unit weight of the soil sample is
Explanation of Solution
Given information:
The volume of moist soil sample is
The moist weight of the soil is
The moisture content of the soil solid is
The specific gravity of soil solids is
Calculation:
Find the moist unit weight
Substitute
Therefore, the moist unit weight of the soil sample is
(b)
Find the dry unit weight of the soil sample.
(b)

Answer to Problem 3.4P
The dry unit weight of the soil sample is
Explanation of Solution
Given information:
The volume of moist soil sample is
The moist weight of the soil is
The moisture content of the soil solid is
The specific gravity of soil solids is
Calculation:
Refer part (a);
The moist unit weight of soil sample is
Find the dry unit weight
Substitute
Therefore, the dry unit weight of the soil sample is
(c)
Find the void ratio of the soil sample.
(c)

Answer to Problem 3.4P
The void ratio of the soil sample is
Explanation of Solution
Given information:
The volume of moist soil sample is
The moist weight of the soil is
The moisture content of the soil solid is
The specific gravity of soil solids is
Calculation:
Refer part (b);
The dry unit weight of soil sample is
Find the void ratio (e) using the equation:
Here, the specific gravity of soil solids is
Substitute
Therefore, the void ratio of the soil sample is
(d)
Find the porosity of the soil sample.
(d)

Answer to Problem 3.4P
The porosity of the soil sample is
Explanation of Solution
Given information:
The volume of moist soil sample is
The moist weight of the soil is
The moisture content of the soil solid is
The specific gravity of soil solids is
Calculation:
Refer part (c);
The void ratio of soil sample is
Find the porosity (n) using the equation:
Substitute 0.626 for e.
Therefore, the porosity of the soil sample is
(e)
Find the degree of saturation of the soil sample.
(e)

Answer to Problem 3.4P
The degree of saturation of the soil sample is
Explanation of Solution
Given information:
The volume of moist soil sample is
The moist weight of the soil is
The moisture content of the soil solid is
The specific gravity of soil solids is
Calculation:
Refer part (c);
The void ratio of soil sample is
Find the degree of saturation (S) using the relation:
Substitute 0.11 for w, 2.7 for
Therefore, the degree of saturation of the soil sample is
(f)
Find the volume occupied by water.
(f)

Answer to Problem 3.4P
The volume occupied by water is
Explanation of Solution
Given information:
The volume of moist soil sample is
The moist weight of the soil is
The moisture content of the soil solid is
The specific gravity of soil solids is
Calculation:
Find the weight of soil
Substitute
Find the weight of water
Substitute
Find the volume occupied by water
Substitute
Therefore, the volume occupied by water is
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Chapter 3 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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