   Chapter 4, Problem 4.8P Principles of Geotechnical Enginee...

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

Solutions

Chapter
Section Principles of Geotechnical Enginee...

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

Refer to the same soil in Problem 4.7. A single test was conducted with the fall cone device and the following results were obtained: d = 17 mm and w = 28.5%. Using Eqs. (4.5), (4.6), and (4.7), estimate the liquid limit by the one-point method.4.7 Following results are obtained for a liquid limit test using a fall cone device. Estimate the liquid limit of the soil and the flow index. To determine

Find the liquid limit value by the one-point method.

Explanation

Given information:

The cone penetration value from the single test (d) is 17 mm.

The moisture content from the single test (w) is 28.5 %.

Calculation:

Draw the graph between the cone penetration and the moisture content as in Figure 1.

Refer Figure 1.

Take the moisture content as 30.5 % for the cone penetration value (d) of 17 mm.

Determine the liquid limit value (LL) using the Eq (4.5):

LL=w0.77logd

Here, w is the moisture content for the cone penetration of 17 mm.

Substitute 30.5 % for w and 17 mm for d.

LL=30.50.77log(17)=32.2%

Thus, the liquid limit value by the one-point method using Eq (4.5) is (LL) is 32.2%_.

Determine the liquid limit value (LL) using the Eq (4.6):

LL=w0.65+0.0175d

Substitute 30.5 % for w and 17 mm for d.

LL=30

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