Environmental Engineering Reference
In-Depth Information
To terminal
Grout
Pressure
gage
Diaphragm
Pneumatic
tubing
Water
pressure
Vent
Inactive
Input
Bentonite
pellets
or chips
Coarse grain sand
Vent
Activated
Piezometer
Input
Ready to use
PZOPNU-1-cdr
PZOPNU-2-cdr
(a)
(b)
FIGURE 4.27
Pneumatic piezometer: (a) piezometer installed in borehole; (b) operating principler. (Courtesy of Slope
Indicator Co.)
Bourdon
gage
Fill surface level
during installation
Nylon tubes containing
deaired water
A
P
Measure pressure P
at Bourdon gage
u w = P +( A
B
u w
B )
γ
w
Porous tip
Clean sand
FIGURE 4.28
Hydraulic-type piezometer (installed in an earth dam).
 
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