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If the value IL > 1, then soil mass is in............ state.
liquid
plastic
solid
semi-solid
liquid
The Liquidity Index (ILтАЛ) is a measure of the relative consistency of a soil mass. If ILтАЛ>1, the natural water content of the soil exceeds its liquid limit, causing the soil to behave like a viscous liquid.
The Liquidity Index (ILтАЛ) is a measure of the relative consistency of a soil mass. If ILтАЛ>1, the natural water content of the soil exceeds its liquid limit, causing the soil to behave like a viscous liquid.
ILтАЛ=IpтАЛwnтАЛтИТwpтАЛтАЛ тАФ where wnтАЛ is natural water content, wpтАЛ is plastic limit, and IpтАЛ is plasticity index.
IpтАЛ=wLтАЛтИТwpтАЛ тАФ definition of plasticity index.
The consistency of fine-grained soil is determined by its water content relative to the Atterberg limits. The Liquidity Index is defined as the ratio of the difference between natural water content and plastic limit to the plasticity index. When ILтАЛ>1, the natural water content is greater than the liquid limit, meaning the shear strength is negligible and the soil mass exists in a liquid state.
Liquidity Index represents the nearness of natural water content to the liquid limit.
If ILтАЛ<0, the soil is in a solid or semi-solid state.
If 0тЙдILтАЛтЙд1, the soil is in a plastic state.
If ILтАЛ>1, the soil behaves as a liquid and has very low shear strength.
Provides a quick assessment of soil consistency in the field.
Essential for evaluating the sensitivity and remolding potential of sensitive clays.
Applicable primarily to cohesive, fine-grained soils.
Does not account for soil structure or fabric effects on strength.
Identification of sensitive or quick clays in geotechnical site investigation.
Used in the classification of consistency for engineering design of foundations.
The range of ILтАЛ indicates soil state: ILтАЛ<0 (Solid/Semi-solid), 0тЙдILтАЛтЙд1 (Plastic), ILтАЛ>1 (Liquid).
Option B (plastic) occurs when the water content is between the plastic limit and the liquid limit, i.e., 0тЙдILтАЛтЙд1.
A is correct тАФ when the liquidity index exceeds 1, the natural water content of the soil is higher than its liquid limit, resulting in a liquid state.
Always remember that ILтАЛ and Liquidity (or sensitivity) are directly related to the water content; high ILтАЛ often indicates high compressibility or potential instability.