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

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

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Soil Mechanics and Foundation
Within the consolidation process of a saturated clay

a gradual decrease in neutral pressure and a gradual increase in effective pressure takes place and sum of the two is constant
both neutral pressure and effective pressure increase
a gradual increase in neutral pressure and a gradual decrease in effective pressure takes place and sum of the two is constant
both neutral pressure and effective pressure decrease

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