Soil Mechanics and Foundation
Toughness index is defined as the ratio of

consistency index to liquidity index
plasticity index to flow index
plasticity index to consistency index
liquidity index to flow index

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Soil Mechanics and Foundation
The rise of water table below the foundation influences the bearing capacity of soil mainly by reducing

effective angle of shearing resistance
effective unit weight of soil and effective angle of shearing resistance
cohesion and effective unit weight of soil
cohesion and effective angle of shearing resistance

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Soil Mechanics and Foundation
In a triaxial compression test when drainage is allowed during the first stage (i. e. application of cell pressure) only and not during the second stage (i.e. application of deviator stress at constant cell pressure), the test is known as

consolidated drained test
consolidated undrained test
unconsolidated undrained test
unconsolidated drained test

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Soil Mechanics and Foundation
If the water table rises upto ground surface, then the

total stress is increased due to decrease in pore water pressure but effective stress does not change
total stress is reduced due to increase in pore water pressure only but effective stress does not change
effective stress is reduced due to increase in pore water pressure only but total stress does not change
effective stress is reduced due to decrease in total stress only but pore water pressure does not change

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