Answered: Geotechnical laboratory tests were…

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter4: Plasticity And Structure Of Soil

Section: Chapter Questions

Problem 4.6P: Refer to the soil in Problem 4.5. Using the Casagrande plasticity chart, graphically estimate the...

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Geotechnical laboratory tests were conducted to determine the liquid limit of soils. The data set shown in Table
1 was obtained by using Casagrande's apparatus on Soil A (Plastic Limit = 32). The data set shown in Table 2
was obtained by using Cone penetrometer on a different Soil B (Plastic Limit = 28).
Table 1. Data from LL cup testing Table 2. Data from Cone penetrometer
(a) Draw the Flow curve for soil A and B.
(b) Calculate the Flow Index for both soils.
(c) Calculate the Liquid limit for both soils.
(d) Calculate the Plasticity and the Liquidity Indices for both soils, if both soils were found to have
the same current water content of 30%.
(e) What can be said about the strengths of the soils in their current state?

Problem 2
Geotechnical laboratory tests were conducted to determine the liquid limit of soils. The data set shown in Table
1 was obtained by using Casagrande's apparatus on Soil A (Plastic Limit = 32). The data set shown in Table 2
was obtained by using Cone penetrometer on a different Soil B (Plastic Limit = 28).
Table 1. Data from LL cup testing
Table 2. Data from Cone penetrometer
Liquid Limit Test Data
Water
content, %
46
42
38
30
28
Specimen
1
2
3
4
5
No. of
blows
16
20
24
32
34
Liquid Limit Test Data
Water
content, %
37
39
44
46
50
Specimen
1
2
3
4
5
Penetration,
mm
16
27
36
54
70
(a) Draw the Flow curve for soil A and B.
(b) Calculate the Flow Index for both soils.
(c) Calculate the Liquid limit for both soils.
(d) Calculate the Plasticity and the Liquidity Indices for both soils, if both soils were found to have
the same current water content of 30%.
(e) What can be said about the strengths of the soils in their current state?

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