Question
Download Solution PDFWhich of the following soil type has the highest value of co-efficient of permeability?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Permeability:
It is defined as the property of a porous material that permits the passage or seepage of water (or other fluids) through its interconnecting voids.
Different types of soil and their standard permeability rate:
|
Type of soil |
Average Size of Particles |
Permeability (k) |
|
Gravel |
80 mm - 4.75 mm |
> 1 cm/sec |
|
Sand |
4.75 mm - 0.075 mm |
1-10-3 cm/sec |
|
Silt |
0.075 mm - 0.002 mm |
10-3 -10-7 cm/sec |
|
Clay |
< 0.002 mm |
< 10-7 cm/sec |
Hence, the value of the co-efficient of permeability is
Coarse sand > Fine sand > Silt > Clay
Additional InformationFactors affecting the permeability of soil:
|
Parameter |
Description |
|
Size of particle |
Higher the size of particle higher will be the permeability |
|
Specific surface area |
Higher the specific surface area lower will be the permeability |
|
Void Ratio |
Higher the void ratio higher the permeability |
|
Viscosity of water |
Higher the viscosity lower will be the permeability and we know that the viscosity of liquids (water) increases with a decrease in temperature and hence, permeability reduces. |
|
Degree of saturation |
Higher the degree of saturation higher the permeability |
|
Entrapped gases |
Higher the amount of entrapped gasses in soil mass lower will be the permeability |
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