SOIL MECHANICS(Chapter 5)
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CLASSIFICATION OF SOIL
BASIC OF GRAIN SIZE-
1. Fine Grained soil-
Silt and Clay size< 0.075 mm.
2. Coarse Grained Soil-
a. Sand- 0.075- 4.75 mm.
(i) Fine Sand- 0.075- 0.425 mm. (ii) Medium Sand- 0.425- 2.0 mm.
(iii) Coarse Sand- 2.0- 4.75 mm.
3. Gravel-
4.75- 80 mm.
(i) Fine- 4.75-20 mm. (ii) Coarse- 20- 80 mm.
GRAVEL
4. Cobble-
80- 300 mm.
COBBLES
5. Boulder-
BOULDER
- Types of Soil-
Soil Type prefix Subgroup Suffix
Gravel G Well Graded W
Sand S Poorly Graded P
Silt M Silty M
Clay C Clayey C
Organic O WL < 35% L
Peat Pt 35< WL< 50 I
WL> 50 H
- MOST ACTIVE MINERAL- Activity Value
Ca-Montmorillionite 1.5
Ilite 0.5- 1.3
Kaolinite 0.3- 0.5
Halloysite 0.1
Calcite 0.2
Quartz 0
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