RESIDUAL SOILS AND TRANSPORTED SOILS - SOIL MECHANICS (StudyCivilEngg.com)

RESIDUAL SOILS & TRANSPORTED SOILS

SUBJECT : SOIL MECHANICS

Soils formed by weathering of rocks may either remain in position at the place of origin or may get transported from the place of origin by various agencies such as wind, water, ice, gravity, etc. The soils which remain in position at the place of origin are known as residual soils, and those which are transported from the place of origin by various agencies are known as transported soils. Residual soils differ very much from transported soils in their characteristics and engineering behaviour.

The residual soil profile may be divided into there zones

• The upper zone in which there is a high degree of weathering and removal of material
• The intermediate zone in which there is some degree of weathering in the top portion and some deposition in the bottom portion
• The partially weathered zone where there is the transition from the weathered material to the unweathered parent rock.

Transported soils may also be referred to as ‘Sedimentary soils’ since the sediments, formed by weathering of rocks, will be transported by agencies such as wind and water to places far away from the place of origin and get deposited when favourable conditions like decrease of velocity occur. During transportation and deposition a high degree of alteration of particle shape, size and texture as also sorting of the grains occurs. A large range of grain sizes and a high degree of smoothness and fineness of individual grains are the typical characteristics of transported soils.

Depending upon the transporting agency and the place of deposition, transported soils may be subdivided as indicated below.

• Alluvial soils : Soils transported by rivers and streams: Sedimentary clays
• Aeoline soils : Soils transported by winds: Loess
• Glacial soils : Soils transported by glaciers: Glacial till
• Lacustrine soils : Soils deposited in lake beds: Lacustrine silts and Lacustrine clays
• Marine Soils : Deposited in sea beds : Marine silts and Marine clays

FAQs COVERED IN THIS POST

What is Residual soils?

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Classify Transported soils depending on the place of deposition and transporting agency?

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