The properties of seven different clayey soils are shown below. Investigate the relationshipbetween the strength and plasticity characteristics by performing the following tasks:SoilBeauharnoisDetroit IHortenGosportMexico CityShellhavenSt. ThuribeMineral% Clayfraction (<2 μm)KaoliniteIllite79364055904136MontmorilloniteHalloysite (hydrated)Halloysite (dehydrated)AttapulgiteAllophaneActivity, A0.520.360.420.894.51.330.33Liquid limit, LL35-10060-120100-900Undisturbed shearstrength (kN/m²)50-7040-55150-250200-25018174129463638a. Estimate the plasticity index for each soil using Skempton's definition of activity.b. Estimate the probable mineral composition of the clay soils based on plasticity index andactivity using the table below.Plastic limit, PL20-4035-6050-100Sensitivity, S,1440-6030-45100-125120-1502.5172.25.37.6150Activity, A0.3-0.50.5-1.21.5-7.00.1-0.20.4-0.60.4-1.30.4-1.3c. Sensitivity refers to the loss of strength when the soil is remolded or disturbed. From thegiven data, estimate the remolded strength for the clay soils.d. Plot the variations of undisturbed and remolded shear strengths with the activity and explainthe observed behavior.

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es of seven different clayey soils are shown below. Investigate the re strength and plasticity characteristics by performing the following ta

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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Concept explainers

Sediment transport

Sediment transport or Soil transport is the movement of solid particles, usually due to the combination of gravitational forces acting on the sediment, and the movement of the liquid at which the sediment enters. Soil erosion occurs in natural systems where the particles are sandstones (sand, rocks), mud, or clay; the liquid is air, water, or ice; and the gravitational force that works to move particles to the landing surface. Sediment transportation or soil migration due to the movement of liquids occurs in rivers, lakes, lakes, oceans, and other bodies of water as a result of currents and waves. Transportation is also caused by glaciers as they flow, and to places on earth under the influence of wind. Soil erosion due to gravity alone is possible in most sloping areas, including hills, scarves, cliffs, and the continental shelf — the continental boundary of the slope.

Question

100%

The properties of seven different clayey soils are shown below. Investigate the relationship
between the strength and plasticity characteristics by performing the following tasks:
Soil
Beauharnois
Detroit I
Horten
Gosport
Mexico City
Shellhaven
St. Thuribe
Mineral
% Clay
fraction (<2 μm)
Kaolinite
Illite
79
36
40
55
90
41
36
Montmorillonite
Halloysite (hydrated)
Halloysite (dehydrated)
Attapulgite
Allophane
Activity, A
0.52
0.36
0.42
0.89
4.5
1.33
0.33
Liquid limit, LL
35-100
60-120
100-900
Undisturbed shear
strength (kN/m²)
50-70
40-55
150-250
200-250
18
17
41
29
46
36
38
a. Estimate the plasticity index for each soil using Skempton's definition of activity.
b. Estimate the probable mineral composition of the clay soils based on plasticity index and
activity using the table below.
Plastic limit, PL
20-40
35-60
50-100
Sensitivity, S,
14
40-60
30-45
100-125
120-150
2.5
17
2.2
5.3
7.6
150
Activity, A
0.3-0.5
0.5-1.2
1.5-7.0
0.1-0.2
0.4-0.6
0.4-1.3
0.4-1.3
c. Sensitivity refers to the loss of strength when the soil is remolded or disturbed. From the
given data, estimate the remolded strength for the clay soils.
d. Plot the variations of undisturbed and remolded shear strengths with the activity and explain
the observed behavior.

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