Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Textbook Question
Chapter 4, Problem 4.6P
Refer to the soil in Problem 4.5. Using the Casagrande plasticity chart, graphically estimate the shrinkage limit of the soil as shown in Figure 4.22.
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:
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.
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The same soil sample has a natural moisture content of 30% and was subject to the
Atterberg Limits test. The plastic limit was measured as 27 while the liquid limit test shows
the results in the table below.
Number of Blows
42
26
10
Moisture Content
20
32
45
a. Determine the liquid limit of the soil sample. Show and briefly explain how you got the
answer.
b. Solve and describe the Plasticity Index of the soil sample.
c. Determine value and soil state of the liquidity index of the soil sample.
d. Determined and describe the clay activity of the soil sample.
Following are the results from the liquid and plastic limit tests for a soil.
Liquid limit test:
let the N1 be 20 and w1 be 30%
let N2 be 30 and w2 be 20%
let N3 be 40 and w3 be 10%
For Plastic limit test:
let w1 be 12 and let w2 be 13 and let w3 be 13.5
The liquid limit =
Plastic limit =
Plasticity Index =
Problem Set 4
4. The following data were obtained from the liquid and plastic limit tests for a soil:
Liquid Limit Test:
Number of blows (N)
Molsture content (%)
a) Draw the flow curve from the
liquid limit test data and find
the liquid limit. (use excel to
graph)
b) What is the plasticity index of
17
42.1
22
38.2
27
36.2
32
34.1
Plastic Limit Test: Moisture content = 21.3%
the soil?
Chapter 4 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
Ch. 4 - During Atterberg limit tests in the soil mechanics...Ch. 4 - Prob. 4.2PCh. 4 - Prob. 4.3PCh. 4 - Results from a liquid limit test conducted on a...Ch. 4 - The following data were obtained by conducting...Ch. 4 - Refer to the soil in Problem 4.5. Using the...Ch. 4 - Following results are obtained for a liquid limit...Ch. 4 - Prob. 4.8PCh. 4 - Prob. 4.9PCh. 4 - Prob. 4.10P
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