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Classification of Coarse Grained Soil

Consider a so...

Question

Consider a soil sample, for which test yield the following results:
Passing 75 micron sieve 62%
Liquid limit 35%
Plasticity index 14%
As per the group index classification of soil, what is the soil condition of the above soil sample?

A

Poor

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B

Fair

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C

Good

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D

Excellent

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Solution

The correct option is B Fair
$p = 62 %$
$L L = 35 %$
$I_{p} = 14 %$
$G I = 0.2 a + 0.005 a c + 0.01 b d$
$a = p - 35$
$= 62 - 35$
$= 27 ≯ 40 = 27$
$b = p - 15$
$= 62 - 15$
$= 47 ≯ 40 = 40$
$c = L L - 40 = 0$
$d = I_{p} - 10 = 14 - 10 = 4$
$G I = 0.2 \times 27 + 0.005 \times 27 \times 0 + 0.01 \times 40 \times 4$
$= 5.4 + 1.6 = 7$

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