| Permeability |
| Permeability
is the property of soil which permits flow of water through its inter connecting
voids. Permeability is an important engineering property which governs the
rate of settlement of saturated compressible soil layers and the rate of
flow of Aquifer. Permeability is taken into account for pump-ing ground
water, spacing well points for de-watering foundation sites for excavation,
retention of water in reservoirs, design of dams and classifica-tion of
soils to be used for various zones of embankments of dams and reser-voirs.
There are two types of permeameters namely constant head and falling head
permeameters. Falling head type are used for testing remolded undis-turbed
fine grained soil. Constant head permeameters are used for coarse grained
cohesion less soils |
| Model
No. |
Description
(Sizes) |
Display |
| I
41 |
JODHPUR
PERMEAMETER
This apparatus is simple, sturdy and truly versatile and can be used for
studying the permeability characteristics of all types of soil samples
under different conditions in the laboratory as well as in the field .
Both falling head and constant head tests can be performed and both remolded
and undis-turbed specimens can be tested.
It consists of Permeability mould Top cap provided with water inlet and
air release vent.
Dynamic compaction base plate. Perforated base plate .Static compaction
flanged end plug, 3cm high Perforated top plate static compaction flanged
end plug 2.5cm high compaction collar 3cm high compaction collar 2.5cm
high split collar
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| I
41.1 |
PERMEABILITY
APPARATUS FOR SOIL :IS 2720 (XVII)
This apparatus is used for the laboratory determination of permeability
of soils using a constant or a variable hydraulic head. This test is
recommended for soils with coefficient of permeability. The maximum
particle size which can be tested in the mould is 10mm.
It consists of a Metallic mould 100mm dia X 127.3mm high X 1000ml volume
Extension collar,100mm dia X 60mm high. drainage base plate with a recess
for a porous stone and with an outlet valve. Metallic clamping ring.
Drainage cap (top plate with a recess for a porous stone and provided
with an inlet valve and an air release valve) Dummy plate to serve as
a false bottom during compaction. Porous stone for drainage base plate
Porous stone for drainage cap Set of three glass pipes approx. 6mm dia.,
10mmdia., and 20mm dia. mounted on a wooden board Length of 3 meter
long rubber connecting tube with a pinch cock
| F
41.1.1 |
Over
head tank |
| F
41.1.2 |
Rammer
2.6kg X 310mm controlled fall |
| F
41.1.3 |
Rammer
4.89kg X 450mm controlled fall |
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| I
41.2 |
PERMEABILITY
APPARATUS FOR SOIL UNIVERSAL TYPE :IS 2720 (XVII)
This apparatus can be used for both constant head type and falling head
permeability studies on all types a soils including clay, silt. sand etc.
It consists of: Metallic mould 100mm dia x 127.3mm high x 1000ml volume.
Extension collar,100mm dia x 60mm high. Drainage base plate with recess
for porous stone and with an outlet valve. Drainage Cap. (Top plate with
a recess for a porous stone and provided with inlet valve and an air release
valve.) Dummy plate to serve as a false bottom during compaction.
Porous stone for drainage base plate. Porous stone for drainage cap. Wooden
stand with nine glass tubes of 6mm, 10mm, 20mm, 25mm, 40mm, 50mm, 60mm,
70mm, 75mm bore. One 75mm tube is provided with overflow arrangement and
the other 75mm dia tube is provided with an air in take tube. Both these
tubes are used for constant head tests. By inserting an open air brass
tube at the top through a rubber stopper the bottom of the air tube will
represent the atmospheric pressure. The constant head will be taken equal
to the difference in levels between the discharge level in the bottom
tank of the permeameter and the bottom portion of air tube. The remaining
seven tubes are used for falling head test. Rubber connecting tube 3mm
long with pinch clamp
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