[PPT]PowerPoint Presentation - · Web viewTitle PowerPoint Presentation Author Jamie...
Transcript of [PPT]PowerPoint Presentation - · Web viewTitle PowerPoint Presentation Author Jamie...
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Ch 10. Soils and Subsidence
A. Soil ClassificationB. Engineering Properties of Soil C. Settlement, Consolidation, Subsidence
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Weathering forms Soils
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Chemical Weathering in Soils
Oxidation: 4FeSiO3 + O2 + H2O FeO(OH) + 4SiO2
Hydration: CaSO4 + 2H2O CaSO4·2H2O
Hydrolysis
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Expansive Soils (clay rich) Platelets of clay Negatively charged surfaces
Adsorb water . Causing expansion
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SoilHorizons
(Illuvial zone)
K Carbonate precipitation and grain coating
R Bedrock (typically with some illuviated clay in fractures)
(Eluvial zone)
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Tropical Soils
Oxisols (Laterites) form in humid tropical climates
Iron and Aluminum oxides
Clays (Kaolinite, Gibbsite, Geothite)
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Formation of Aluminum Ore
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Arid Soils
Upward movement of soil water transports salts into shallow soil
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Soil Orders Soil Taxonomy Classification System Table 10.3
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US Soils
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Engineering Classification of Soils Based on:
grainsize and plasticity (i.e., clay content)
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USCS (ASTM D-2487)
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Galveston Bay Subsidence
Houston and coastal areas subsiding sue to pumping
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Land Subsidence
Subsidence related to pumping
Reduced pressure increases weight supported by soil skeleton
Water is expelled and land subsides
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Interferometer Satellite
imagery used to detect subsidence on a mm scale
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