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Principles of Geotechnical Enginee...

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

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BuyFindarrow_forward

Principles of Geotechnical Enginee...

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

Refer to the soil in Problem 4.1.

a. Determine the flow index.

b. Determine the liquidity index of the soil if the in situ moisture content is 21%.

4.1 During Atterberg limit tests in the soil mechanics laboratory, the students obtained the following results from a clayey soil.

Liquid limit tests:

images

Plastic limit tests: Students conducted two trials and found that PL = 17.2% for the first trial and PL = 17.8% for the second trial.

a. Draw the flow curve and obtain the liquid limit.

b. What is the plasticity index of the soil? Use an average value of PL from the two plastic limit trails.

(a)

To determine

Find the flow index for the soil.

Explanation

Given information:

The plastic limit of value of first trial PL1 is 17.2 %.

The plastic limit of value of second trial PL2 is 17.8 %.

Calculation:

Draw the graph between the number of flows and moisture content as in Figure 1.

Determine the flow index for the soil (IF) using the relation.

IF=w1w2log(N2N1)

Here, w1 is the moisture content of soil corresponding to the N1 blows and w2 is the moisture content of soil corresponding to the N2 blows

(b)

To determine

Find the liquidity index of the soil.

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