Chapter 2, Problem 2.1P

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9th Edition

Braja M. Das + 1 other

ISBN: 9781305970939

Textbook Problem

For a gravel with *D*_{60} = 0.48 mm, *D*_{30} = 0.25 mm, and *D*_{10} = 0.11 mm, calculate the uniformity coefficient and the coefficient of gradation. Is it a well-graded or a poorly graded soil?

To determine

Calculate the uniformity coefficient, the coefficient of gradation, and state is it a well-graded or a poorly-graded soil.

Answer

The uniformity coefficient is

The coefficient of gradation is

The soil is well-graded.

Explanation

Given information:

The diameter of the particle corresponding to

The diameter of the particle corresponding to

The diameter of the particle corresponding to

Calculation:

Calculate the uniformity coefficient

Substitute

Hence, the uniformity coefficient is

Calculate the coefficient of gradation

Substitute

Hence, the coefficient of gradation is

The value of uniformity coefficient is greater than 4

Therefore, the soil is well-graded.

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