Concept explainers
(a)
Find the void ratio of soil specimen.
(a)

Answer to Problem 2.1P
The void ratio of soil is 0.76.
Explanation of Solution
Given information:
The mass (m) of the soil is
The volume (v) of the soil is
The moisture content (w) is 15%.
The specific gravity
Calculation:
Consider the unit weight of water
Calculate the moist unit weight of the soil
Calculate the dry unit weight of the soil
Calculate the void ratio (e) using the relation as shown below:
Hence, the void ratio of soil is 0.76.
(b)
Calculate the porosity of soil.
(b)

Answer to Problem 2.1P
The porosity of soil is
Explanation of Solution
Calculation:
Refer to part (a).
The void ratio of soil is
Calculate the void ratio
Substitute
Hence, the porosity of soil is
(c)
Calculate the dry unit weight of soil.
(c)

Answer to Problem 2.1P
The dry unit weight of soil is
Explanation of Solution
Calculation:
Calculate the dry unit weight of the soil
Refer to part (a).
Base on result, the dry unit weight of the soil is
Thus, the dry unit weight of soil is
(d)
Calculate the moist unit weight of soil.
(d)

Answer to Problem 2.1P
The moist unit weight of soil is
Explanation of Solution
Calculation:
Calculate the moist unit weight of the soil
Refer to part (a).
Base on result, the dry unit weight of the soil is
Thus, the moist unit weight of soil is
(e)
Calculate the degree of saturation.
(e)

Answer to Problem 2.1P
The degree of saturation is
Explanation of Solution
Calculation:
Refer to part (a).
The void ratio of soil is
Calculate the degree of saturation
Hence, the degree of saturation is
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Chapter 2 Solutions
EBK PRINCIPLES OF FOUNDATION ENGINEERIN
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