What do mean by coarse grain soil and fine grained soil.

What do mean by coarse grain soil and fine grained soil.
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1 Answer

Answer :

Coarse Grain Soil:-

1. If more than 50% of soil is retained on sieve 0.075mm it is called as coarse grain soil.

2. A coarse grain soil is called as gravel if 50% or more of the coarse fraction is retained on 4.75mm IS sieve else it is termed as sand.

3. Coarse grain soil contains less 5% fine are called as GW and SW if they are well graded.

4. If they are poorly graded they are graded by symbol GP and SP.

5. If the percentage of fines lie between 5% to 12% coarse grain soil are designated by symbol GW-GM.

Fine Grain Soil:-

1. A soil is termed as fine grain soil if more than 50% of soil passes through 0.075mm.

2. Fine grain soil is sub divided soil in silt, based on their liquid limit and plasticity index.

3. The fine grain soil are subdivided into soil possessing low or high plasticity when the liquid limit is less than 50% or more than 50% respectively. Organic soil are also included in fine grain soil.
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