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9th Edition

Braja M. Das + 1 other

Publisher: Cengage Learning

ISBN: 9781305970939

Chapter 2, Problem 2.1P

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?

Expert Solution

To determine

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

The uniformity coefficient is

The coefficient of gradation is

The soil is well-graded.

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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Get SolutionsPrinciples of Geotechnical Engineering (MindTap Course List)

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Ch. 2 - For a gravel with D60 = 0.48 mm, D30 = 0.25 mm,...Ch. 2 - The following values for a sand are given: D10 =...Ch. 2 - The grain-size distribution curves for three...Ch. 2 - The following are the results of a sieve analysis....Ch. 2 - Repeat Problem 2.4 with the following data. 2.4...Ch. 2 - Repeat Problem 2.4 with the following data. 2.4...Ch. 2 - Repeat Problem 2.4 with the following data. 2.4...Ch. 2 - The following are the results of a sieve and...Ch. 2 - Repeat Problem 2.8 using the following data. 2.8...Ch. 2 - Repeat Problem 2.8 using the following data. 2.8...

Ch. 2 - The grain-size characteristics of a soil are given...Ch. 2 - Repeat Problem 2.11 with the following data. 2.11...Ch. 2 - Repeat Problem 2.11 with the following data. 2.11...Ch. 2 - A hydrometer test has the following result: Gs =...Ch. 2 - Repeat Problem 2.14 with the following values: Gs...Ch. 2 - Three groups of students from the Geotechnical...Ch. 2 - Refer to Problem 2.C.1. Results of the sieve...

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