Geotechnical Engineering

Factors Affecting Permeability

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Loudon’s experiments demonstrated the relationship between _____________
Permeability and specific surface
Permeability and grain size
Permeability and adsorbed water
Permeability and volume
Explanation:
Loudon’s experiment demonstrated that the permeability of coarse grained soils is inversely proportional to the specific surface at a given porosity.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
What is the approximate value, which can be taken as void ratio occupied by adsorbed water?
1
0
0.1
10
Explanation:
According to approximation value after casagrande, 0.1 may be taken as the void ratio occupied by adsorbed water.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
What is the effect of adsorbed water on the permeability of soil?
Structural arrangement is varied
Reduced degree of saturation
Size of the particles is diminished
Reduces the pore size
Explanation:
The adsorbed water surrounding the fine soil particles is not free to move, and reduces the effective pore space available for the passage of water.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Which of the following factors affects the permeability of soil?
Grain size
Properties of pore fluid
Void ratio of soils
All of the mentioned
Explanation:
Grain size, properties of pore fluid, structural soil arrangement of soil particles, entrapped air and foreign matter and adsorbed water.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
What is the constant value of a and b in Loudon’s empirical formula “log10(KSs2) = a + bn”?
1 and 0
1.515 and 1.365
1.365 and 1.515
0 and 1
Explanation:
Based on his experiments, Loudon found out the value of a and b s 1.365 and 1.515 for permeability of 10°c.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
The effect of structural disturbance is on permeability is more in _____________
Fine-grained soil
Coarse grained soil
Clay soil
All of the mentioned
Explanation:
The effect of structural disturbance on permeability is much pronounced in fine-grained soil than any other.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Based on Allen Hazen experiments, permeability can be expressed as ___________
K=CD102
K=CD210
K=DC210
K=DC102
Explanation:
In 1892, Allen Hazen based on his experiment on filter of sand particles between 0.1 and 3 mm, found that the permeability can be expressed as K=CD102.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
The structural arrangement of soil Particle vary depending upon ______________
Method of deposition and Compacting the soil mass
Degree of saturation
None of the mentioned
All of the mentioned
Explanation:
The structural arrangement of the particle may vary, at the same void ratio, depending upon the method of deposition or compacting the soil mass.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
What is the relationship between permeability and viscosity of water?
Directly proportional
Inversely proportional
Both are equal
None of the mentioned
Explanation:
From Poiseuille’s law, K=Ds2 γw /ɳ
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Physical permeability of a soil KP is related to the coefficient of permeability by the equation ___________
KP=kɳ
KP=kɳ/γW
KP=k/ɳ
KP=k γW
Explanation:
In 1937, Muskat pointed out a relationship between physical permeability and Darcy’s coefficient of permeability as KP=kɳ/γW.