Soil Mechanics and Foundation
Effective stress is

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

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Soil Mechanics and Foundation
If the material of the base of the Casagrande liquid limit device on which the cup containing soil paste drops is softer than the standard hard rubber, then

The liquid limit of soil may decrease
The liquid limit of soil always increases
The liquid limit of soil always decreases
The liquid limit of soil may increase

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