Geotechnical Engineering

Collapsible Soils

Question 1
Marks : +2 | -2
Pass Ratio : 8%
If the collapsible potential values of the soil are 0-1 %.what will be the severity of the problem?
Severe problem
Moderate problem
No problem
None of the mentioned
Explanation:
The severity of the problem will be zero, if the CP value lies between 0-1 percent.
Question 2
Marks : +2 | -2
Pass Ratio : 15%
Collapsible soils undergoes large decrease in volume due to __________
Decrease in moisture content
Increase in moisture content
Increase in solubility
None of the mentioned
Explanation:
Collapsible soils undergo large increase in volume due to an increase in moisture content, even without increasing in external loads.
Question 3
Marks : +2 | -2
Pass Ratio : 8%
The capillary potential (CP) of the collapsible soil varies with _________
Degree of saturation and Pressure
Water content present
All of the mentioned
None of the mentioned
Explanation:
The bulk of structural collapse occurs upon the first saturation, at a given over-burden pressure. Hence collapsible potential varies with degree of saturation and pressure.
Question 4
Marks : +2 | -2
Pass Ratio : 8%
collapsible soils are usually present in areas of __________
Semi-arid regions and Arid regions
Dry regions
All of the mentioned
None of the mentioned
Explanation:
Since collapsible soil exhibit loose, weakly cemented sands they are usually present in arid and semi- arid regions.
Question 5
Marks : +2 | -2
Pass Ratio : 8%
The structural collapse for a clay soil usually occurs at __________
First saturation
Last
Does not occur
At an intermediate
Explanation:
As there is a sudden compression of the soil under pressure, the structural collapse occurs upon first saturation.
Question 6
Marks : +2 | -2
Pass Ratio : 8%
A clay specimen has an unconfined compressive strength of 240 Kn/m2 in a distributed state. On remolding, the unconfined compressive strength is 54 Kn/m2. What will be the sensitivity of clay?
3.85
7.24
2.04
4.44
Explanation:
Sensitivity,
Question 7
Marks : +2 | -2
Pass Ratio : 8%
The loose bulky grains in collapsible soil are held together by__________
Inter-molecular force between the soil
Compressive stress
Capillary stress
All of the mentioned
Explanation:
As the common Feature exhibited by collapsible soil is capillary stress, the loose bulky grains in the soil are held together by it.
Question 8
Marks : +2 | -2
Pass Ratio : 8%
The researchers who have provided guidance for identifying the potential, foot clayey sand and sand clay found in western US is __________
Macveren
Holtz and Gibbs
All of the mentioned
None of the mentioned
Explanation:
In 1967, Holtz and Gibbs provide guidance for identifying the potential collapsible soil in arid and semi-arid regions.
Question 9
Marks : +2 | -2
Pass Ratio : 8%
At a given overburden pressure (Po) for a collapsible soil, its collapsible potential depends on _________
Degree of saturation
Temperature coefficient
Moisture content
Pressure
Explanation:
Collapsible potential varies with degree of saturation, at an overburden pressure of Po.
Question 10
Marks : +2 | -2
Pass Ratio : 8%
Which of the following is exhibited by collapsible soil?
Silts where cementing agent is soluble
Loose bulky grains hold together by capillary stresses
All of the mentioned
None of the mentioned
Explanation:
A common feature of collapsible soil is the loose bulky grain held together by capillary stresses.