1. A fine-grained soil has a liquid limit of 300% and a plastic limit of 55%. The natural water contentof the soil in the field is 80% and clay content is 60%.Determine the plasticity index, the liquidity indexWhat is the soil state in the field?a.b.C.If this soil were under a concrete slab used as a foundation for a building and water wereto seep into it from watering of a lawn, what would you expect to happen to thefoundation?2. A liquid limit test, conducted on a soil sample in the cup device, gave the following results:No. of Blows10401945.22339.82736.5Water Content (%)60.025.2Two determinations for the plastic limit gave water contents of 20.3% and 20.8%. Determine...a. The liquid limit and plastic limitb. The plasticity indexc. The liquidity index if the natural water content is 27.4%d. The void ratio at the liquid limit if Gs = 2.7. If the soil is saturated and is loaded to failure,would you expect a brittle failure?3. The following results were recorded in a shrinkage limit test using mercury. Determine theshrinkage limit.Mass of containerMass of wet soil and containerMass of dishMass of dish and displaced mercury17.5 grams78.1 grams130.0 grams462.0 grams64.4 gramsMass of dry soil and container4. Particle size analyses were carried out on two soils - Soil A and Soil B - and the particle sizedistribution curves are shown in the figure. The Atterberg limits for the two soils are:Soil LLAB26 (Oven-Dried; Assume same for not dried)NonplasticConstituentPercent of particles greater than 0.075mmGravel fraction (%)Sand fraction (%)Silt fraction (%)Clay fraction (%)PL18Soil A120125929Soil B801665200a. Classify these soils according to USCS and ASTM-CSb. Is either of the soils organic?c. In a preliminary assessment, which of the two soils is a better material for the core of a rolledearth dam?d. Using AASHTO system. Which soil is better for a subgrade?

Liquid limit = LL = 300%Plastic limit = PL = 55%Water content = w = 80%Clay content = C = 60%NOTE -…

1. A fine-grained soil has a liquid limit of 300% and a plastic limit of 55%. The natural water content of the soil in the field is 80% and clay content is 60%. a. b. C. Determine the plasticity index, the liquidity index What is the soil state in the field? If this soil were under a concrete slab used as a foundation for a building and water were to seep into it from watering of a lawn, what would you expect to happen to the foundation?

1. A fine-grained soil has a liquid limit of 300% and a plastic limit of 55%. The natural water content of the soil in the field is 80% and clay content is 60%. a. b. C. Determine the plasticity index, the liquidity index What is the soil state in the field? If this soil were under a concrete slab used as a foundation for a building and water were to seep into it from watering of a lawn, what would you expect to happen to the foundation?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

1. A fine-grained soil has a liquid limit of 300% and a plastic limit of 55%. The natural water content
of the soil in the field is 80% and clay content is 60%.
Determine the plasticity index, the liquidity index
What is the soil state in the field?
a.
b.
C.
If this soil were under a concrete slab used as a foundation for a building and water were
to seep into it from watering of a lawn, what would you expect to happen to the
foundation?
2. A liquid limit test, conducted on a soil sample in the cup device, gave the following results:
No. of Blows
10
40
19
45.2
23
39.8
27
36.5
Water Content (%)
60.0
25.2
Two determinations for the plastic limit gave water contents of 20.3% and 20.8%. Determine...
a. The liquid limit and plastic limit
b. The plasticity index
c. The liquidity index if the natural water content is 27.4%
d. The void ratio at the liquid limit if Gs = 2.7. If the soil is saturated and is loaded to failure,
would you expect a brittle failure?
3. The following results were recorded in a shrinkage limit test using mercury. Determine the
shrinkage limit.
Mass of container
Mass of wet soil and container
Mass of dish
Mass of dish and displaced mercury
17.5 grams
78.1 grams
130.0 grams
462.0 grams
64.4 grams
Mass of dry soil and container
4. Particle size analyses were carried out on two soils - Soil A and Soil B - and the particle size
distribution curves are shown in the figure. The Atterberg limits for the two soils are:
Soil LL
A
B
26 (Oven-Dried; Assume same for not dried)
Nonplastic
Constituent
Percent of particles greater than 0.075mm
Gravel fraction (%)
Sand fraction (%)
Silt fraction (%)
Clay fraction (%)
PL
18
Soil A
12
0
12
59
29
Soil B
80
16
65
20
0
a. Classify these soils according to USCS and ASTM-CS
b. Is either of the soils organic?
c. In a preliminary assessment, which of the two soils is a better material for the core of a rolled
earth dam?
d. Using AASHTO system. Which soil is better for a subgrade?

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