Soil as a three phase system
soil as a three phase system

Soil as a three phase system

A soil  as a three phase system consisting of solid particles (called soil grains), water and air. The void space between the soil grains is filled partly with water and partly with air. However, if we take a dry soil mass, the voids are filled with air only. In case of a perfectly saturated soil, the voids are filled completely with water. In general, the soil mass has three constituents which do not occupy separate spaces but are blended together forming a complex material [Fig.a)], the properties of which depend upon the relative percentages of these constituents, their arrangement and a variety of other factors. For calculation purposes, it is always more convenient to show these constituents occupying separate spaces, as shown in Fig.(b)(i) and Fig. (b)(ii). As shown in Fig.(b) (i), the total volume V of the soil mass consists of (i) volume of air Va, (ii) volume of water…

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The Term Soil
the term soil

The Term Soil

The Term Soil The term ‘Soil’ has various meanings, depending upon the general professional field in which it is being considered. To an agriculturist, soil is the substance existing on the earth’s surface, which grows and develops plant life. To the geologist also, soil is the material in the relatively thin surface zone within which roots occur, and all the rest of the crust is grouped under the term rock irrespective of its hardness. To an engineer, soil is the unaggregated or uncemented deposits of mineral and/or organic particles or fragments covering large portion of the earth’s crust. It includes widely different materials like boulders, sands, gravels, clays and silts, and the range in the particle sizes in a soil may extend from grains only a fraction of a micron (10–4 cm) in diameter up to large size boulders. Soil engineering, Soil Mechanics or Geotechnique is one of the youngest…

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