Page 231 - Geotechnical Engineering Soil and Foundation Principles and Practice
P. 231
Pore Water Pressure, Capillary Water, and Frost Action
226 Geotechnical Engineering
Figure 11.10
Ink-bottle
hypothesis to
explain capillary
hysteresis.
Figure 11.11
Adsorption and
desorption curves
for a loessial soil
in the Tama soil
series, after
Richards (1941).
cycle can be expected to leave some of the ‘‘ink-bottles’’ full of water so that the
second cycle tends to retain higher moisture contents. Another factor may be
modification of the voids themselves, particularly as this soil contains expansive
clay mineral.
As a practical matter, water that is drawn up into soil underneath a pavement as
the result of a temperature gradient or freezing will tend to be retained according
to the desorption instead of the adsorption part of the cycle, resulting in higher
retained moisture contents.
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