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In which one of the following pairs of soil types would you anticipate negative pore pressure when subjected to shearing?

In which one of the following pairs of soil types would you anticipate negative pore pressure when subjected to shearing? Correct Answer Dense sand and overconsolidated clay

Concept:

A pore pressure parameter greater than one is associated with a loose structure, either in sand or clay, which collapses upon load application.

On the other hand, if we have a sample of sand or clay which tends to expand upon loading, negative pore pressure can be developed.

If a sample of dense sand is subjected to shear, it tends to expand. This is due to the soil particles trying to ride on each other during sliding. The expansion under shear is termed as “Dilatancy”.

In case of saturated dense sands if there is sudden application of stress in the field, the soil does not get time to expand and negative pore water pressure develop.

In case of loose sands, they try to compress by bringing their grains closer together. This results in reduced effective stress and reduction in corresponding shear strength.

If fine sands in the saturated condition are subjected to sudden loading, the tendency towards volume reduction causes pore water pressure to increase instantaneously. This causes a large decrease in the shear resistance. 

So dense sand and over-consolidated clay would anticipate negative pore pressure when subjected to shearing.

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