Chapter 6, Problem 6.17P

### Principles of Geotechnical Enginee...

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

Chapter
Section

### Principles of Geotechnical Enginee...

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

# Vibroflotation is being considered for in situ densification of a thick deposit of granular soils at a particular site. The results of the sieve analysis of the proposed backfill material is shown in Figure 6.41.Figure 6.41Determine the suitability number, SN, and rate it as a backfill material.

To determine

Find the suitability number and the rating for backfill material.

Explanation

Determine the suitability number SN using the relation.

SN=1.73(D50)2+1(D20)2+1(D50)2

Here, D50 is the diameter through the 50 % material passes, D20 is the diameter through the 20 % material passes, and D10 is the diameter through the 10 % material passes.

Refer Figure 6.41, take the D50 value as 0.6 mm, D20 value as 0.2 mm, and D10 value as 0

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