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

Refer to Problem 3.28. To improve the bearing capacity of the same sub-base, the field engineers decided to increase the relative density to 88% by additional compaction. What would be the final dry unit weight of the compacted sub-base?

3.28 In a highway project, the granular sub-base layer is compacted to a moist unit weight of 122 lb/ft3 at a moisture content of 16%. What is the relative density of the compacted sub-base? Given: emax = 0.85, emin = 0.42, and Gs = 2.68.

To determine

Calculate the dry unit weight of the compacted sub-base.


Given information:

The maximum void ratio (emax) is 0.85.

The minimum void ratio (emin) is 0.42.

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

The moist unit weight (γ) is 122lb/ft3.

The moisture content (w) is 16%.

The relative density of compaction (Dr) is 88%.


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

Calculate the void ratio (e) using the relation.


Substitute 0.85 for emax, 0.42 for emin, and 88% for Dr

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