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What are Expansive What are Expansive Soils?Soils?
Vertisol Soils, or known as Shrink Swell SoilsVertisol Soils, or known as Shrink Swell Soils
The Soil contracts due to its clay minerals and The Soil contracts due to its clay minerals and the structure of the clay allowing water to be the structure of the clay allowing water to be imbedded in-between the clay layersimbedded in-between the clay layers
Process is reversible, and causes contraction Process is reversible, and causes contraction of the soilof the soil
What can be done?What can be done?
Test soil before buildingTest soil before building
If expansion is greater then 10 %, it is criticalIf expansion is greater then 10 %, it is critical
Remove soilRemove soil
Mix soil with material that does not expandMix soil with material that does not expand
Keep consistent soil moistureKeep consistent soil moisture
Have strong foundations in buildings that can Have strong foundations in buildings that can handle the changes in volume.handle the changes in volume.
SourcesSources
http://www.azgs.state.az.us/GEOHAZARDS/images/http://www.azgs.state.az.us/GEOHAZARDS/images/soils_popcorn_.jpgsoils_popcorn_.jpg
http://www.aegweb.org/images/Geologichttp://www.aegweb.org/images/Geologic%2520Hazards/expansive_map.gif&imgrefurl=http://%2520Hazards/expansive_map.gif&imgrefurl=http://www.aegweb.org/www.aegweb.org/
Geology: Chernicoff and WhitneyGeology: Chernicoff and Whitney
Geology and the Environment: PipkinGeology and the Environment: Pipkin
http://geology.com/articles/soil/soil-cracks-large.jpghttp://geology.com/articles/soil/soil-cracks-large.jpg
http://www.centremapslive.co.uk/fck_files/Image/http://www.centremapslive.co.uk/fck_files/Image/BGS_Geosure/shrink.jpgBGS_Geosure/shrink.jpg
http://www.aaa-inspect.com/Plastic%20Soil.JPGhttp://www.aaa-inspect.com/Plastic%20Soil.JPG
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