Get Unified Soil Classification System

In the Indian Standard Soil Classification System (ISSCS), soils are classified into groups according to size, and the groups are further divided into coarse, medium and fine sub-groups. The grain-size range is used as the basis for grouping soil particles into boulder, cobble, gravel, sand, silt or clay.

The squeeze test. To do this test, be sure your soil is damp, but not soaking wet. Grab a small handful of the soil in your hand. ... The ribbon test. Take a handful of damp soil and make a ribbon by rolling the soil between your hands. ... The jar test. The jar test is for the scientists in the crowd.

SM. Silty sands, sand-silt mixtures. SC. Clayey sands, sand-clay mixtures. FINE-GRAINED SOILS (50% or more of material is smaller than No.

Soil can be categorised into sand, clay, silt, peat, chalk and loam types of soil based on the dominating size of the particles within a soil.

Explanation: In 1940, casagrande originally developed the unified soil classification system (USCS).

Identify the soil as a SILTY GRAVEL (GM) or a SILTY SAND (SM) if the fines are silty as determined by the pro- cedures for fine-grained soil identification.

The system of soil classification used by the National Cooperative Soil Survey has six categories (Soil Survey Staff, 1999). Beginning with the broadest, these categories are the Order, Suborder, Great Group, Subgroup, family, and Series. ... Each order is identified by a word ending in 'sol. ' An example is Alfisols.

The USCS has three major classification groups: (1) coarse-grained soils (e.g. sands and gravels); (2) fine-grained soils (e.g. silts and clays); and (3) highly organic soils (referred to as "peat"). The USCS further subdivides the three major soil classes for clarification.

Soils are classified according to their stability. Soil samples are taken on the site to determine soil class. A geotechnical engineer's report will clearly state the likely soil conditions and recommend a suitable footing system.