Question

Ex. 6.1: A constant head permeameter, gives a discharge of 200 ml in
115 seconds under a constant head of 400 mm. Determine the permeability if the
soil sample was 250 mm long and 3000 mm? in area.
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Answer 1

Answer:

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Explanation:

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Answer 2

The permeability of soils is influenced by a variety of parameters, including particle size, water impurities, void ratio, saturation, and adsorbed water, as well as entrapped air and organic material.

The soil grains are the microscopic solid particles that make up a soil mass. When these soil grains deposit in a soil mass, they organise themselves in such a way that some empty space remains between them. These areas are referred to as voids.

Permeability refers to the ability of a soil to allow water or any other liquid to flow through its voids. The ease with which water may move through soils is referred to as permeability.

Mathematically, permeability is given by

k = $\frac{q.L}{A.h}$

where,

k = permeablity of the soil

q = discharge

L = Length of specimen

A = cross sectional Area of specimen

h = constant head causing flow

Given that

h = 400 mm

q = 1.74 ml/sec

L = 250 mm

A = 3000 mm²

∴ k = $\frac{1.74*250}{400*3000}$

∴ k = 0.000029 mm/sec