1.1 General
Permeability is the property of a porous sensible which permits the passage or seepage of water or another(prenominal) quiets through its interconnecting voids. A material having continuous voids is called permeable. Gravels ar extremely permeable while stiff trunk is the least permeable, and consequently such a clay whitethorn be termed impermeable for all practical purposes.
The flow of water through soils may either be a bedded flow or a libertine flow. In laminar flow, each fluid particle travels along a definite path which never crosses the path of any other particle. In turbulent flow, the paths are irregular and twisting, crossing and recrossing at random (Taylor, 1948). In or so of the practical flow problems in soil mechanics, the flow is laminar i.e. Darcys law (v = k i) is valid.
Figure 1. Zones of laminar and turbulent flows (After Taylor, 1948)
Table 1. Coefficient of permeability in different soils
Soil fibre k (cm/sec)|
Clean gravel 100-1.0Coarse sand 1.0-0.
01Fine sand 0.01-0.001Silty clay 0.001-0.00001|
Clay <0.000001
|
1.2 Statement of the Thesis
The thesis involves the determination of permeability for spunky materials and development of a new equation of permeability by comparing among the commonly used data-based formulae. Several empirical equations to calculate hydraulic...If you want to get a full essay, rescript it on our website: Orderessay
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