Factor permeability of soil depends -
(1). Effect of size and shape of particles: -
Permeability varies approximately as the square of the grain size. Since soils consist of many different sized grains, some specific grain size has to be used for comparison. Allen Hazen , based on his experiment on filter sands of particle size between 0.1 and 3mm , found that the permeability can be expressed as
k=CD2 10
k = Coefficient of peremeability.
D 10 = effective diameter
ii) Effect of properties of pore fluid:-
Permeability is directly proportional to the unit weight of water and inversely proportional to its viscosity. There is a great variation in viscosity with temperature hence when other factors remain constant , the effect of the property of water on the values of permeability can be expressed as
K1/K2=2/1.
iii) Effect of voids ratio:
The effect of voids ratio on the values of pemeability can be
iv) Effect of structural arrangement of particles and stratification:
The structural arrangement of the particle may vary, at the same void ratio, depending upon the method of deposition of soil mass. The structure may be entirely different for a disturbed sample as compared to an undisturbed sample which may process stratification. The effect of structural disturbance on permeability is much pronounced in fine grained soil.
(v) temperature is a very important.
(vi) Entrapped air and organic impurities.
(vii) Adsorbed water
(Viii) Degree of saturation
(ix) Structure of soil mass.
Uses for flow net.
1. Determination of seepage.
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