Test: Factors Affecting Permeability - Civil Engineering (CE) MCQ

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.

Grain size, properties of pore fluid, structural soil arrangement of soil particles, entrapped air and foreign matter and adsorbed water.

 In 1937, Muskat pointed out a relationship between physical permeability and Darcy’s coefficient of permeability as KP=kɳ/γW.

Loudon’s experiment demonstrated that, the permeability of coarse grained soils is inversely proportional to the specific surface at a given porosity.

Based on his experiments, Loudon found out the value of a and b s 1.365 and 1.515 for permeability of 10°c.

From Poiseuille’s law, K=Ds2 γw /ɳ
It is found that permeability is directly proportional to the unit weight of water and inversely proportional to its viscosity.

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.

According to approximation value after casagrande, 0.1 may be taken as the void ratio occupied by adsorbed water.

The effect of structural disturbance on permeability is much pronounced in fine-grained soil than any other.

The structural arrangement of the particle may vary, at the same void ratio, depending upon the method of deposition or compacting the soil mass.