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

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

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Soil Mechanics and Foundation
Coefficient of compressibility is

different for different types of soils but same for a soil under different states of consolidation
different for different types of soils and also different for a soil under different states of consolidation
constant for any type of soil
independent of type of soil but depends on the stress history of soil

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