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Statement I): Saturated fine, as well as medium, sands of uniform particle size are most susceptible to liquefaction. Statement II): Fine particles reduce the permeability which is a prime factor for liquefaction.

Statement I): Saturated fine, as well as medium, sands of uniform particle size are most susceptible to liquefaction. Statement II): Fine particles reduce the permeability which is a prime factor for liquefaction. Correct Answer Both Statement I) and Statement II) are individually true and Statement II) is the correct explanation of Statement I)

Concept:

If the rate of loading is larger and the soil is fully saturated with gravity water then positive pore water pressure will develop. This will reduce effective stress and hence shear strength of the soil. A time comes when the effective stress reduces to zero, the soil will lose all its shear strength. This phenomenon is known as liquefaction.  

This occurs in sands because sand does not have any cohesion while in clay soils  even effective stresses are reduced to zero, because of cohesion they may possess some shear strength.

The presence of fine particles reduces the permeability. Thus, it will increase the chance of liquefaction as the dissipation of excess pore water pressure become more difficult.

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