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Introduction of USCS ( Unified Soil Classification System )

USCS Classifies Soils into Two Broad Categories

Coarse-Grained Soils

Fine-Grained Soils

Highly Organic Soils

Uscs Soil Classification Astm

Uscs Soil Classification Grain Size

Coarse-Grained Soils

Uscs Soil Classification

Uscs Classification

What Is Uscs?

Plasticity Chart Uscs

Uscs Plasticity Chart

Ch Soil

Uscs Symbols

• W: Well-graded soil
• P: Poorly graded soil
• G: Gravel
• S: Sand
• M: Silt
• C: Clay
• O: Organic soil
• H: High plasticity clay
• L: Low plasticity clay
• F: Silty clay
• A: Inorganic soil (i.e. no organic content)
• B: Plasticity index of 4-7
• M: Plasticity index of 7-20
• H: Plasticity index > 20
• L: Liquid limit < 50
• H: Liquid limit > 50

Uscs Soil Classification Calculator Excel

• Open a new Excel spreadsheet and create a table with the following headings: "Grain Size (mm)", "% Passing", "USCS Symbol", "Atterberg Limits", "Soil Type".
• Enter the grain size range for each soil type in the "Grain Size (mm)" column.
• Enter the percentage passing values for each grain size range in the "% Passing" column.
• Use the USCS symbols table to determine the appropriate USCS symbol for each soil type based on its percentage of fines and grain size distribution.
• Determine the Atterberg limits (liquid limit and plasticity index) for each soil type, and enter them in the "Atterberg Limits" column.
• Use the plasticity chart to determine the soil type based on the Atterberg limits and enter it in the "Soil Type" column.
• Use the VLOOKUP or IF functions in Excel to automatically calculate the USCS symbol and soil type based on the grain size distribution and Atterberg limits entered.
• Save the spreadsheet and use it to quickly determine the USCS symbol and soil type for different soil samples.

Gw Soil

Uscs System

• Coarse Grained Soils
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