Soil Mechanics and Foundation Engineering Classification of Soils

The A-line in the unified classification system table is used to determine the plasticity index (I_P) of soil sample on its liquid limit (W_L). The equation for the A-line is given as ________.

1

I_P = 0.5 (20 - W_L)

2

I_P = W_L - 40

3

I_P = 0.73 (40 - W_L)

4

I_P = 0.73 (W_L - 20)

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