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Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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When soil is at liquid limit, liquidity index = ...........
0
1
infinity
none of these
1
The Liquidity Index (IL) is a consistency index used to define the state of cohesive soil relative to its liquid limit (LL) and plastic limit (PL). When the natural water content (wn) of the soil is equal to its liquid limit (LL), the liquidity index becomes exactly 1.
The Liquidity Index (IL) is a consistency index used to define the state of cohesive soil relative to its liquid limit (LL) and plastic limit (PL). When the natural water content (wn) of the soil is equal to its liquid limit (LL), the liquidity index becomes exactly 1.
IL=LL−PLwn−PL — Definition of Liquidity Index
IL=1 when wn=LL — Condition at Liquid Limit
The liquidity index is defined as IL=IPwn−PL, where IP is the plasticity index (LL−PL). By substituting wn=LL into the equation, we get IL=LL−PLLL−PL=1. This signifies that the soil is in a liquid state, possessing high sensitivity and low shear strength.
If IL<0, soil is in a semi-solid or solid state.
If 0<IL<1, soil is in a plastic state.
If IL>1, soil behaves as a liquid (viscous fluid).
Liquidity index helps in assessing the consistency and sensitivity of fine-grained soils.
Provides a quantitative measure of soil consistency.
Essential for evaluating the shear strength characteristics of clayey soils.
Foundation engineering for settlement prediction.
Assessment of soil sensitivity and remolding potential.
At the plastic limit (wn=PL), the liquidity index IL is 0.
Option A (0) corresponds to the Plastic Limit.
Option B (1) correctly corresponds to the Liquid Limit.
B is correct — At the liquid limit, the water content equals the liquid limit, which mathematically results in a liquidity index of 1.
Always remember that IL=0 at the Plastic Limit and IL=1 at the Liquid Limit; these are standard benchmarks for soil consistency evaluation.