SOIL DEPOSITS GEOLOGIC ORIGIN AND MODE OF OCCURRENCE BASICS AND TUTORIALS

GEOLOGIC OCCURRENCE OF SOIL DEPOSITS
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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