   Chapter 3, Problem 3.28P 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

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 relative density of the compacted sub-base.

Explanation

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%.

Calculation:

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

Calculate the void ratio (e) using the relation.

γ=(1+w)Gsγw1+e

Substitute 2.68 for Gs, 62.4lb/ft3 for γw, 16% for w, and 122lb/ft3 for γ

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