   Chapter 3, Problem 3.5P 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

Two undisturbed soil samples, each having a volume of 0.1 ft3, are collected from different depths of the same soil layer. For sample A, located above the groundwater table, W = 11 lb and w = 9%. Sample B is located below the groundwater table. If Gs = 2.68, determinea. Void ratio of Ab. Degree of saturation of Ac. Water content of Bd. Total weight of B

(a)

To determine

Calculate the void ratio of sample A.

Explanation

Given information:

Consider the two undisturbed soil sample as sample A and sample B.

The volume (V) of the each soil sample is 0.1ft3.

The weight of sample A (W) is 11lb.

The moisture content of sample A (w) is 9%.

The specific gravity of the soil solids (Gs) is 2.68.

Calculation:

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

Calculate the dry unit weight of the soil (γd) using the relation.

γd=WV(1+w)

Substitute 11lb for W, 0.1ft3 for V, and 9% for w.

γd=110.1×(1+9100)=110

(b)

To determine

Calculate the degree of saturation of sample A.

(c)

To determine

Calculate the water content of sample B.

(d)

To determine

Calculate the total weight of B.

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