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Permeability

The document contains a table with measurements from a permeability test on a soil specimen. It also includes a table classifying soil types by permeability. Based on the measurements in the first table, the soil specimen has a permeability classification of silty sand with medium permeability.

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shikar marmar
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55 views2 pages

Permeability

The document contains a table with measurements from a permeability test on a soil specimen. It also includes a table classifying soil types by permeability. Based on the measurements in the first table, the soil specimen has a permeability classification of silty sand with medium permeability.

Uploaded by

shikar marmar
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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 Calculation:

h1 h2 t Q in Q out T L V specimen specimen


(h) (d)
96.8 49.8 127.4 70 63.4 15 26.1 40 13 10

The following table is going to explain the type & permeability of Soil:-
Typical of soil K,(cm/sec) Degree of permeablility
Medium or coarse gravel >1 High
Fine gravel 1-10-1 High
Fine sand 10-1-10-2 Medium
Silty sand 10-2-10-3 Medium
Silt and clay sand 10-3-10-4 Low
Silty clay 10-4-10-5 Very Low
Clay 10-5-10-6 Practically imperious

 Our result is Silty sand, Medium degree permeability.


((Discussion))
 Permeability (or hydraulic conductivity) refers to the ease with
which water can flow through a soil. This property is necessary for
estimating the quantity of underground seepage under various
hydraulic conditions, for investigating problems involving the
pumping of water for underground construction, and for making
stability analyses of earth dams and earth-retaining structures that
are subject to seepage forces.
 The objective of this test to determine the coefficient of permeability
(k) for a given soil sample using falling head method , and to
determine permeability of sands and gravels containing little or
no silt.
 The design of earth dams is very much based upon the permeability
of the soils used.
 The stability of slopes and retaining structures can be greatly affected
by the permeability of the soils involved.
 Filters made of soils are designed based upon their permeability.
 Estimating the quantity of underground seepage.
 Factors affecting permeability:
 Particle size.
 Properties of pore water.
 Degree of saturation.
 Presence of entrapped air and other foreign matter.
 Structural arrangement.
 Stratification of soil.
 Usually the finer soil texture. The slower the permeability and also
the structure may greatly modify the permeability rates.
 Tighter packing and smaller particles = less permeability.
 Looser packing and larger particles = more permeability.

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