The pore pressure measuring apparatus consists of a
screw pressure pump, null indicator in Perspex, pressure gauge, mercury
manometer, volume change burette and the necessary connecting tubes and
valves. It is used for measuring pore water pressure and pore air pressure
in soils. It has many features, which simplify the operation. The Null
Indicator is made from a transparent Perspex block. It is a simplified
U-Tube Null Indicator, in which water can bypass mercury if null indicator
is tilted; thus de-airing process by circulation of water is facilitated.
All features enable a visual check to be made during the de-airing operation
of apparatus. A mercury manometer and a pressure gauge of Bourdon Tube type
are provided on the panel on which the whole equipment is mounted. Very
small positive or negative pressures are observed on the manometer. A 50 ml
burette is clamped to a sliding bracket on one side of the panel. It is used
for measuring the volume change in the specimen when subjected to confining
pressure in the triaxial cell.
The following models of Pore Pressure Apparatus are available:
- Pore Pressure Apparatus, 1000 kPa (10 kg/cm2) capacity
The equipment consists of:
- Pressure Gauge, Bourdon Tube Type, Graduation: -1.0 to +10 bar in
0.1 bar division (or -100 to +1,000 kPa in 10 kPa divisions) Dia:
200 mm.
- Manometer, Glass U Tube, measures low positive and negative pore
pressure and checks zero error of pressure gauge. It is provided
with a mercury trap. (Mercury supplied at extra cost).
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