Process and Impacts of Soil Compaction Clean Water Summit... Basic Definitions . Soil Components...

Process and Impacts of Soil Compaction John Chapman

Program Director Erosion and Stormwater Management Certification Program

Bioproducts and Biosystems Engineering Department University of Minnesota chapm155@umn.edu

Clean Water Summit September 13, 2012

http://adventuresofacouchsurfer.wordpress.com/tag/dalton-gang/

Basic Definitions

Soil Components

• Voids

• Solids

Soil Components

• Voids

• Solids

Soil Components

• Voids

– Air

– Water

• Solids

Soil Components

• Voids

– Water

• Solids

Soil Components

• Voids

– Air

– Water

• Solids

– Particle Size

– Gravel, Sand, Silt, Clay

– Loam

– Organics

Dry or wet sand?

http://flickr.com/photo/56844661@N00/4846203074

Photo from: Dr. Kovacevic, Geotechnical Consulting Group London

Compaction

Caterpillar 815F Soil Compactor

Wacker Neuson Vibratory Plate Compactor

Moisture Density Relationship

Moisture Content

Soil

Den

sity

m

ass/

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me

Moisture Density Relationship

Moisture Content

Soil

Den

sity

m

ass/

volu

me

Optimum Moisture

Maximum Density

Moisture Density Relationship

Moisture Content

Soil

Den

sity

m

ass/

volu

me

From: www.extension.umn.edu/distribution/crop systems/dc3115.html

Soil clods

From: www.extension.umn.edu/distribution/crop systems/dc3115.html

Cone Index of Construction Site Soils

• Rooting Limited at 2000 to 2500 kPa

• Silty Loam 5000 kPa

• Sandy Loam at surface 2000 kPa

• Sandy Loam at 12 inches 3000 kPa

Thank You