   Chapter 3, Problem 3.21P Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
ISBN: 9781305970939

Solutions

Chapter
Section Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
ISBN: 9781305970939
Textbook Problem

The degree of saturation of a soil is 55% and the moist unit weight is 106 lb/ft3. When the moist unit weight increased to 114 lb/ft3, the degree of saturation increased to 82.2%. Determine:a. Gsb. Void ratio

(a)

To determine

Calculate the specific gravity of soil solids.

Explanation

Given information:

The degree of saturation (S1) is 55%.

The moist unit weight of soil (γ1) is 106lb/ft3.

The degree of saturation (S2) is 82.2%.

The moist unit weight of soil (γ2) is 114lb/ft3.

Calculation:

Consider the unit weight of water (γw) is 62.4lb/ft3.

Calculate the specific gravity of soil solids (Gs) using the relation.

γ=(Gs+Se)γw1+e (1)

For 55% of saturation:

Substitute 106lb/ft3 for γ, 62.4lb/ft3 for γw, and 55% for S in Equation (1).

106=(Gs+55100e)×62.41+e106+106e=(Gs+0

(b)

To determine

Calculate the void ratio of the soil.

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