Soil Mechanics and Foundation
Effective stress is

important because it is a function of engineering properties of soil
a physical parameter that can be measured
the stress at particles contact
All of these

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Soil Mechanics and Foundation
The average coefficient of permeability of natural deposits

Parallel to stratification is always less than that perpendicular to stratification
Parallel to stratification is always greater than that perpendicular to stratification
Parallel to stratification may or may not be greater than that perpendicular to stratification
Is always same in both directions

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