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Process and Impacts of Soil Compaction John Chapman
Program Director Erosion and Stormwater Management Certification Program
Bioproducts and Biosystems Engineering Department University of Minnesota [email protected]
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/
volu
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