Chapter 2, Problem 2.3P

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9th Edition

Braja M. Das + 1 other

ISBN: 9781305970939

Textbook Problem

The grain-size distribution curves for three different sands (*A*, *B*, and *C*) are shown in Figure 2.34.

**Figure 2.34**

**a.** Determine the uniformity coefficient and the coefficient of gradation for each soil.

**b.** Identify if the soils are well graded or poorly graded based on Part a.

(a)

To determine

Calculate the uniformity coefficient *A*, *B*, and *C*.

Explanation

Sketch the grain size distribution curve for sands *A*, *B*, and *C* as shown in Figure 1.

Refer to Figure 1.

For sand *A*:

The diameter of the particle corresponding to

The diameter of the particle corresponding to

The diameter of the particle corresponding to

For sand *B*:

The diameter of the particle corresponding to

The diameter of the particle corresponding to

The diameter of the particle corresponding to

For sand *C*:

The diameter of the particle corresponding to

The diameter of the particle corresponding to

The diameter of the particle corresponding to

Calculate the uniformity coefficient

For sand *A*:

Substitute

Hence, the uniformity coefficient for sand *A* is

For sand *B*:

Substitute

(b)

To determine

State the sands *A*, *B*, and *C* are well-graded or a poorly-graded.

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