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Unified Soil Classification System Training






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Unified Soil Classification System Training. Part B - USCS using Laboratory Data. USDA. cobbles. clay. silt. sand. gravel. 2 m. # 4. 3”. .05 mm. USCS. cobbles. fines. sand. gravel. # 4. 3”. .074 mm. Comparison of Particle Size Definitions. # 200. ASTM Standards .
Unified Soil Classification System Training

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Unified soil classification system training l.jpgSlide 1

Unified Soil Classification System Training

Part B - USCS using Laboratory Data

Comparison of particle size definitions l.jpgSlide 2

USDA

cobbles

clay

silt

sand

gravel

2 m

# 4

3”

.05 mm

USCS

cobbles

fines

sand

gravel

# 4

3”

.074 mm

Comparison of Particle Size Definitions

# 200

Astm standards l.jpgSlide 3

ASTM Standards

  • Lab Data Classification is byASTM D2487

  • Classification of Peat Samples, see ASTM D 4427

  • Field Classification is by D2488

Comparison of particle size definitions4 l.jpgSlide 4

Comparison of Particle Size Definitions

Activity 2 particle size comparisons l.jpgSlide 5

Activity 2 - Particle Size Comparisons

Uscs flow chart activity 3 l.jpgSlide 6

USCS Flow Chart - Activity 3

Flow chart overview l.jpgSlide 7

Flow Chart Overview

  • Two Broad Categories

    • Fine-Grained - 50% or more finer than the # 200 sieve

    • Coarse-Grained - Less than 50% finer than the # 200 sieve

Uscs overview l.jpgSlide 8

USCS Overview

Flow chart overview9 l.jpgSlide 9

Flow Chart Overview

  • Fine-Grained Soils

    • Organic ( LL ratio < 0.75 )

    • Inorganic (no odor and LL ratio not < 0.75)

    • Classify by LL, PI

    • Modifiers are H or L for LL value, C or M for plasticity and O for organic

Uscs overview10 l.jpgSlide 10

USCS Overview

Activity 4 organic soil l.jpgSlide 11

Activity 4 - Organic Soil

Solve 4 samples

Abbreviations fine grained l.jpgSlide 12

Abbreviations Fine-Grained

  • H - High LL ( > 50 )

  • L - Low LL ( < 50 )

  • C - Plastic Fines

  • M - Nonplastic or slightly plastic fines

  • O - Organic

  • Pt - Peat

Activity 5 plasticity chart l.jpgSlide 13

Activity 5 - Plasticity Chart

Activity 5 plasticity chart14 l.jpgSlide 14

Activity 5 - Plasticity Chart

Solve 4 samples

Activity 7 classify fine grained samples l.jpgSlide 15

Activity 7 - Classify Fine-Grained Samples

Assume 6 samples are not organic and classify by USCS

Flow chart overview16 l.jpgSlide 16

Flow Chart Overview

  • Coarse-Grained Soils - 3 Groups

    • Clean - Less than 5 % Fines

    • Dirty - More than 12 % Fines

    • Dual - From 5% to 12% Fines, inclusive

Coarse grained soils l.jpgSlide 17

Coarse-grained Soils

Abbreviations sands and gravels l.jpgSlide 18

Abbreviations Sands and Gravels

  • G - Gravel

  • S - Sand

  • P - Poorly Graded

  • W - Well Graded

Sieve analyses l.jpgSlide 19

% gravel = % finer 3”minus % finer # 4

% sand = % finer # 4 minus % finer # 200

% fines = % finer than # 200 sieve

Sieve Analyses

Percent particle categories l.jpgSlide 20

Percent Particle Categories

  • To compute % Gravel subtract % finer than # 4 from % finer than 3”

  • To compute % Sand subtract % finer than # 200 from % finer than # 4

  • Percent Fines is % finer than # 200

Activity 8 l.jpgSlide 21

Activity 8

For 7 samples, fill out Activity

Additional definitions l.jpgSlide 22

Additional Definitions

  • To Classify Clean Coarse-Grained Soils, you must first plot grain-size curve and determine three parameters

    D10, D30, D60

Determining d 10 d 30 and d 60 l.jpgSlide 23

Determining D10, D30, and D60

60

% finer

D60, millimeters

30

10

D30, millimeters

D10, millimeters

Computing cu and cc l.jpgSlide 24

Computing CU and CC

Coefficient of Uniformity

High Values Indicate Well-Graded Soil

Coefficient of Curvature

Values Between 1-3 Indicate Well-Graded Soil

Activity 9 l.jpgSlide 25

Activity 9

Plot Curve from Data, compute CU Value

Activity 10 l.jpgSlide 26

Activity 10

Plot Curve from Data, compute CC Value

C haracterizing clean sands and gravels l.jpgSlide 27

Well graded

Characterizing Clean Sands and Gravels

Clean Well Graded Sands and Gravels have less than 5 % fines and a wide range of particle sizes that are equally distributed

% Finer

Particle Size

Poorly graded sands and gravels l.jpgSlide 28

Either Mostly One-Size Particle

Or Gap-

Graded

% Finer

% Finer

Poorly graded

Gap graded

Particle Size

Particle Size

Poorly GradedSands and Gravels

Clean well poorly graded definitions l.jpgSlide 29

Sands

less than 5 % fines

CU > 6

CC = 1-3

Gravels

less than 5 % fines

CU > 4

CC = 1-3

Clean, Well/Poorly Graded Definitions

Activity 11 problems l.jpgSlide 30

Activity 11 - Problems

1. Verify % Fines - Coarse-Grained/Clean

2. Compute % Gravel and % Sand

3. Note which predominates

4. Using provided CU and CC, Determine whether poorly or well graded

5. Determine Correct USCS classification

Activity 12 l.jpgSlide 31

Activity 12

Review Example Soil

Activity 13 l.jpgSlide 32

Activity 13

Use Flow Chart, Classify Soil

Activity 14 summary of classifications of coarse grained soils l.jpgSlide 33

Activity 14 Summary of Classifications of Coarse-Grained Soils

  • Clean Sands and Gravels (< 5% fines)

    • Clean Poorly Graded Gravels GP

    • Clean Well Graded Gravels GW

    • Clean Poorly Graded Sands SP

    • Clean Well Graded Sands SW

Dirty coarse grained soils l.jpgSlide 34

Dirty Coarse-Grained Soils

  • If a sample has less than 50 % Fines

  • And it has more than 12 % Fines, it is a Dirty Coarse-Grained Soil

  • To Classify, follow the flow chart and the following steps

Dirty coarse grained soil l.jpgSlide 35

Dirty Coarse-Grained Soil

  • Determine whether there is a greater % of Sand or Gravel

    • % G = % finer 3” minus # 4

    • % S = % finer # 4 minus # 200

  • Determine where minus # 40 fines plot on plasticity chart

Dirty sands and gravels l.jpgSlide 36

Sands

Gravels

Dirty Sands and Gravels

  • SC - Fines Plot Above A-Line

  • SM - Fines Plot Below A-Line

  • SC-SM - Fines Plot in Hatched Zone

  • GC - Fines Plot Above A-Line

  • GM - Fines Plot Below A-Line

  • GC-GM - Fines Plot in Hatched Zone

Activity 16 problems l.jpgSlide 37

Activity 16 - Problems

Activity 17 example of classifying dual classification coarse grained soil l.jpgSlide 38

Activity 17 - Example of Classifying Dual-Classification Coarse-Grained Soil

Activity 18 problem l.jpgSlide 39

Activity 18 - Problem

Activity 20 review questions l.jpgSlide 40

Activity 20 - Review Questions

Activity 21 comprehensive problems l.jpgSlide 41

Activity 21 - Comprehensive Problems


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