Graphical Classification of Grain Sizes
Image:
Grain sizes classification [Source: visaplan GmbH]
Table:
Characteristics of certain types of soil [Fellin]
| Organic Soil | Clay | Silt | Sand / Gravel | Stones / Blocks |
|---|---|---|---|---|
| Not suitable from a structural point of view | Cohesive, tends to puff up or shrink with changing water content, very low permeability | Non to slightly cohesive, frost sensitive, easily liquefiable, poorly compactable, erosion-prone, low permeability | Good subsoil (if at least moderately compacted), medium to high permeability, low compressibility, high angle of friction, good compactability (given a well-graded particle size distribution), not very prone to weather conditions and erosion |
Very stable (the more angular the individual stones are, the stronger the entire structure is); Boulders (> 7.87 in (200 mm)) are often used as support structures |
