Permeability test Factors| Manufacturer and Supplier

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Permeability test Factors:

Permeability test is used to determine the property of the soil to transmit water and air.
The constant of permeability in soil mechanics is used to measure that how easily water can flow through an absorbent soil medium.

By using the discontinuity geometry we can control the permeability of rock masses. The discontinuity geometry includes discontinuity width, direction, spacing and form, also the roughness of the discontinuity surfaces and the degree of unveiling can be controlled by it.

Methods to determine permeability:

The followings methods are used in the laboratory to determine permeability.
  • Constant head permeameter
  • Direct or indirect measurement during an Oedometer test
  • Falling or variable head permeameter
  • Horizontal capillarity test.

Factors affecting permeability of soils:

Adsorbed water:

The fine grained soils have a layer of adsorbed water strongly attached to their surface.

Degree of saturation:

The soil can contain the air pockets formed due to entrapped air if the soil is not fully saturated.

Impurities in water:

Any foreign matter in the water has a propensity to plug the flow passage and decrease the permeability of soils.

Particle size:

Permeability can be varied approximately according to the square of grain size.

Properties of pore fluid:

Permeability is inversely proportional to is viscosity and directly proportional to the unit weight of water.

Shape of particles:

The shape of particles also can affect the permeability of soil.

Structure of soil mass:

Flaky soil deposits have greater permissibility parallels to the plane of stratification then that vertical to this plane.

Void ratio of soil:

In a given soil value of the coefficient of permeability is based on its void ratio.

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