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

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

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Soil Mechanics and Foundation
In a deposit of normally consolidated clay

effective stress, water content and undrained strength decrease with depth
effective stress increases with depth but water content of soil and un-drained strength decrease with depth
effective stress and undrained strength increase with depth but water content decreases with depth
effective stress and water content increase with depth but undrained strength decreases with depth

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