Unified Soil Classification System - Wikipedia
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.
Always check with your State agency's standards and specifications when using these guidelines. The first letter in the naming describes the major constituents of the soil (G-gravel, S-sand, M-silt, C-clay, O-organic). The second letter describes characteristics of the soil.
Soil Classification | Natural Resources Conservation Service
Descriptions and distribution maps of the twelve soil orders. The Soil Taxonomy Forum is an online discussion site for the soil classification system. It is sponsored by USDA-NRCS and hosted by Virginia Tech University.
Determine percentages of sand and gravel from grain-size curve. Depending on percentage of fines (fraction smaller than No. 200 sieve size), coarse-grained soils are classified as follows: Less than 5 percent .................................... GW, GP, SW, SP. More than 12 percent ... ............................... GM, GC, SM, SC.
Unified Soil Classification System (USCS) – theconstructor.org
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.
Unified Soil Classification System (USCS): With 3 Major Divisions
2024年8月4日 · The Unified soil classification system has provided a plasticity chart based on the data on the liquid limit and the plasticity index. A line on the chart is known as the A-line. If the data on the LL and PL plot both lies above the A-line then the soil is classified as clay.
Unified Soil Classification System (USCS) - Dream Civil
2022年6月23日 · The Unified soil classification system has provided a plasticity chart based on the data on the liquid limit and the plasticity index. A line on the chart is known as the A-line. If the data on the LL and PL plot both lies above the A-line then the soil is classified as clay.
The Unified Soil Classification System (USCS)
2024年4月15日 · The specific rules for classification are summarized as follows and described in detail in ASTM D 2487. Organic soils are distinguished by a dark-brown to black color, an organic odor, and visible fibrous matter.
Give typical name: Indicate approximate percentage of sand and gravel, maximum size, angularity, surface condition, and hardness of the coarse grains; local or geologic name and other pertinent descriptive information, and symbol in parentheses.
Is soil highly organic, coarse grained, or fine grained? Highly Organic Soils (Pt) Color, odor, very high moisture content, particles of plant life, fibrous.