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The Unified Soil Classification System uses a two-letter system to name different soil types. The chart below also includes a plasticity chart that is used to determine the classification of fine-grained soils.
NRCS delivers science-based soil information to help farmers, ranchers, foresters, and other land managers effectively manage, conserve, and appraise their most valuable investment — the soil.
UNIFIED SOIL CLASSIFICATION AND SYMBOL CHART. COARSE-GRAINED SOILS (more than 50% of material is larger than No. 200 sieve size.) Clean Gravels (Less than 5% fines) Well-graded gravels, gravel-sand GW mixtures, little or no fines. GRAVELS.
The Unified Soil Classification System (USCS) is a soil classification system used in engineering and geology to describe the texture and grain size of a soil. The classification system can be applied to most unconsolidated materials, and is represented by a two-letter symbol.
Soils are broadly classified into three divisions: Coarse grained soils: In these soils, 50% or more of the total material by weight is larger than 75 micron IS sieve size. Fine grained soils: In these soils, 50% or more of the total material by weight is smaller than 75 micron IS sieve size.
Soil Classification Outline. Overview. Identify different soil types. Understand the methods of testing the soil. Understand the soil mechanics. Understand the weight of the soil. Review case studies. Understanding workers rights. Soil Types.
Technical guides are the primary scientific references for NRCS. They contain technical information about the conservation of soil, water, air, and related plant and animal resources.
Classify the soils using the results of the manual tests and the identifying criteria shown in table 3-7. Possible inorganic soils include lean clay (CL), fat clay (CH), silt (ML), and elastic silt (MH). The properties of an elastic silt are similar to those for a lean clay.
The Unified Soil Classification System is useful in the design and construction of various civil engineering projects, such as foundation design, earthworks, and soil stabilization. It provides a standardized language for communicating soil properties, which helps engineers and geologists to better understand and analyze soil behavior.
The four basic soil types are: gravel, sand, silt, or clay. Because soil can contain all of these components, the classification system is used to describe the major components; for example, clayey sand with gravel, sandy silt, or silty clay with sand.