Primary Discussion on Permeability Test for Finding a New Equation Essay

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CHAPTER 1 : INTRODUCTION 1.1 General Permeability is the property of a porous material which permits the passage or seepage of water or other fluids through its interconnecting voids. A material having continuous voids is called permeable. Gravels are highly permeable while stiff clay is the least permeable, and hence such a clay may be termed impermeable for all practical purposes. The flow of water through soils may either be a laminar flow or a turbulent 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 most of the practical flow problems in soil mechanics, the flow is laminar i.e. Darcy’s 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 type 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 granular materials and development of a new equation of permeability by comparing

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