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Principles of Geotechnical Enginee...

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

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Chapter
Section
BuyFindarrow_forward

Principles of Geotechnical Enginee...

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

During a subsurface exploration, an undisturbed soil sample was collected from the field using a split-spoon sampler for laboratory evaluation (see Figure 17.6 in Chapter 17). The sample has a diameter of 1.375 in., length of 18 in., and a moist weight of 1.85 lb. If the oven-dried weight was 1.5 lb and Gs = 2.74, calculate the following:

a. Moist unit weight

b. Moisture content

c. Dry unit weight

d. Void ratio

e. Degree of saturation

images

Figure 17.6 Split-spoon sampler, unassembled (Courtesy of ELE International)

(a)

To determine

Calculate the moist unit weight of soil.

Explanation

Given information:

The diameter of the sample (d) is 1.375in..

The length of the sampler (L) is 18in..

The moist weight (W) of the sample is 1.85lb.

The oven-dried weight (WS) of the sample is 1.5lb.

The specific gravity of the soil solids (Gs) is 2.74.

Calculation:

Calculate the volume of the sampler (V) using the relation.

V=14πd2L

Substitute 1.375in. for d and 18in. for L.

V=14π×1

(b)

To determine

Calculate the moisture content.

(c)

To determine

Calculate the dry unit weight of soil.

(d)

To determine

Calculate the void ratio of soil.

(e)

To determine

Calculate the degree of saturation.

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