Soil Mechanics Tutorials
a. Principal Soil Deposits
Soil deposits grouped in terms of origin (e.g., residual, colluvial, etc.) and mode of occurrence (e.g., fluvial, lacustrine, etc.).
b. Importance.
A geologic description assists in correlating experiences between several sites, and in a general sense, indicates the pattern of strata to be expected prior to making a field investigation (test borings, etc.).
Soils with similar origin and mode of occurrence are expected to have comparable if not similar engineering properties.
For quantitative foundation analysis, a geological description is inadequate and more specific classification is required.
A study of references on local geology should precede a major subsurface exploration program.
c. Soil Horizon.
Soil horizons are present in all sedimentary soils and transported soils subject to weathering. The A horizon contains the maximum amount of organic matter; the underlying B horizon contains clays, sesquioxides, and small amounts of organic matter.
The C horizon is partly weathered parent soil or rock and the D horizon is unaltered parent soil and rock.
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