Principles of Geotechnical Enginee...

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



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, determine

a. Void ratio of A

b. Degree of saturation of A

c. Water content of B

d. Total weight of B


To determine

Calculate the void ratio of sample A.


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.


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

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


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



To determine

Calculate the degree of saturation of sample A.


To determine

Calculate the water content of sample B.


To determine

Calculate the total weight of B.

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