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Soil Classification

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Title: Foundation Design for The United States Penitentiary Author: Veronica Last modified by: user Created Date: 4/28/2002 5:43:05 PM Document presentation format – PowerPoint PPT presentation

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Title: Soil Classification


1
Soil Classification
Sources Soil Mechanics Laboratory
Manual,B.M. DAS (Chapters 9)
2
Class Outlines
  • Soil Classification Systems
  • USCS
  • AASHTO
  • USCS Classification System

3
USCS Classification System
  • Originally developed for the United States Army
  • The method is standardized in ASTM D 2487 as
    Unified Soil Classification System (USCS)
  • USCS is the most common soil classification
    system among geotechnical engineers
  • A typical USCS classification would be

SM
Silty sand with gravel
-
Group Symbol
Group Name
4
Naming Convention
  • Fine-grained Soil
  • First Letter Second
    Letter
  • M Silt L Low plastic
  • C Clay H High plastic
  • O Organic
  • Coarse-grained Soil
  • First Letter Second
    Letter
  • S Sand P Poorly graded
  • G Gravel W Well graded
  • M Silty
  • C - Clayey

5
Classification of Soils
  • From sieve analysis and the grain-size
    distribution curve determine the percent passing
    as the following
  • gt 3 inch Cobble or Boulders
  • 3 inch - 4 (76.2 4.75 mm) Gravel
  • 4 - 200 (4.75 - 0.075 mm) Sand
  • lt 200 Fines
  • First, Find passing 200
  • If (5) or more of soil passes 200 sieve, then
    conduct Atterberg Limits test (LL PL)

6
Grain Size Distribution Curves
Cobbles or Boulders
7
Classification of Soils
  • If the soil is fine-grained ( 50 passes 200)
    follow the guidelines for fine-grained soils
  • If the soil is coarse-grained (lt50 passes 200)
    follow the guidelines for coarse-grained soils
  • Find Gravel Sand
  • Calculate Cu Cc
  • Calculate LL, PL and PI

8
Fine-grained Soils
9
Coarse-grained Soils
10
Example Soil A
Gravel 98-62 36
Sand 62-8 54
Fines 8
Cu 46.67Cc 0.95
Soil A D60 4.2 mm , D30 0.6 mm, D10 0.09
mm
11
Example Soil A (Cont.)
Gravel 36Sand 54Fines 8 Cu 46.7 Cc
0.95
LL 42PL 31PI 42-31 11
GO TO Plasticity Chart
12
Example Soil A (Cont.)
LL 42PL 31PI 42-31 11
ML
13
Example Soil A (Cont.)
  • Soil A is then classified as
  • SP-SM Poorly-grades sand with silt and gravel
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