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
Degree of consolidation is

directly proportional to square of drainage path and inversely proportional to time
directly proportional to time and inversely proportional to drainage path
directly proportional to drainage path and inversely proportional to time
directly proportional to time and inversely proportional to square of drainage path

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Soil Mechanics and Foundation
With the increase in the amount of compaction energy

optimum water content decreases but maximum dry density increases
optimum water content increases but maximum dry density decreases
both optimum water content and maximum dry density increase
both optimum water content and maximum dry density decrease[ES 93]

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