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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 liquid limit determined in Problem 4.5 using the percussion cup method (ASTM 4318). Estimate the liquid limit for the same soil if the fall cone method (BS 1377) were used. Use Eq. (4.8).

4.5 The following data were obtained by conducting liquid limit and plastic limit tests on a soil collected from the site.

Liquid limit tests:

images

Plastic limit test: PL = 19.3%

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

b. Using the Casagrande plasticity chart (Figure 4.21), determine the soil type.

To determine

Find the liquid limit value of the soil using fall cone method.

Explanation

Given information:

The plastic limit of the soil PL is 19.3 %.

Calculation:

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

Refer Figure 1.

The liquid limit value for the 25 number of blows is 37.05 %.

Determine the liquid limit value by one point method.

LL(BS)=2.6+0.94[LL(ASTM)]

Substitute 37

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