Volume Change Testing
Volume Change Testing
Volume Change Testing
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3) Pressure plate tests<br />
Procedure<br />
a) Place unsaturated soil in pressure plate extractor and<br />
allow water to enter soil until soil comes to<br />
equilibrium;<br />
b) Vary air pressure incrementally (drying or wetting<br />
cycles) and maintain water pressure at<br />
atmospheric pressure until soil comes to<br />
equilibrium (no water flow) and measure water<br />
volume changes to determine water content.<br />
Measurements and Calculations<br />
Air pressure and water volume (content) measurements<br />
to calculate matric suction and water content.<br />
<strong>Volume</strong> <strong>Change</strong> Indices<br />
w<br />
or<br />
θ<br />
b<br />
m,ms<br />
dw<br />
=<br />
d(<br />
u −u<br />
a<br />
w<br />
)<br />
D<br />
m,<br />
ms<br />
dw<br />
=<br />
d log( u −u<br />
(ua – uw) log (ua – uw)<br />
UNSAT13 - 5<br />
a<br />
w<br />
)
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