Explain the factors effecting permeabiliity

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Asked: June 26, 20222022-06-26T22:31:58+05:30 2022-06-26T22:31:58+05:30In: Geotechnical Engineering

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Vipin Chauhan · Accepted Answer · 2022-07-31T12:22:03+05:30

Size of Soil Particle: Permeability varies according to the size of the soil particle. For coarse-grained, permeability is more for fine-grained, and permeability is low.
Specific Surface Area of Particles: Specific surface area of soil particles also affects permeability. Higher the specific surface area lower will be the permeability.
Shape of Soil Particle: Rounded Particles will have more permeability than angular shaped. It is due to the specific surface area of angular particles being more compared to rounded particles.
Void Ratio: The void ratio increases with Permeability.
Soil Structure: The structure of any two similar soil masses at the same void ratio need not be the same. It varies on the level of compaction applied.
Degree of Saturation: Partially saturated soil contains air voids that are formed due to entrapped air or gas released from the percolating fluid or water. This air will block the flow path thereby reducing the permeability.
Water Properties: Various properties of water or fluid such as unit weight and viscosity also affect the permeability.
Temperature: Temperature also affects the permeability of soils. Greater temperature results in higher permeability.
Adsorbed Water: Adsorbed water is the water layer formed around the soil particle, especially in the case of fine-grained soils. It reduces permeability.
Organic matter: Organic matter decreases permeability.