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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

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

Draw the flow curve and find the liquid limit.

Answer

The liquid limit obtained from the flow curve is 29.0%_.

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.

images

Refer Figure 1.

The liquid limit value for the 25 number of blows is 29.0 %.

Therefore, the liquid limit obtained from the flow curve is 29.0%_.

(b)

To determine

Find the plasticity index of the soil.

Answer

The plasticity index of the soil is 11.5%_.

Explanation

Given information:

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

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

Calculation:

Determine the average plasticity limit value (PLavg) using the relation.

PLavg=PL1+PL22

Substitute 17.2 % for PL1 and 17.8 % for PL2.

PLavg=17.2+17.82=17.5%

Determine the plasticity index of the soil PI using the relation.

PI=LLPLavg

Substitute 29.0 % for LL and 17.5 % for PLavg.

PI=29.017.5=11.5%

Therefore, the plasticity index of the soil is 11.5%_.

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