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where:
Fig. 16.68. The percent consolidation versus the depth into the
soil is shown in Fig. 16.69. The theoretical curves computed
using the rheological model (i.e., Eq. 16.102) are in close
agreement with the experimental data.
The rheological model is not meant to be used for solv-
ing practical engineering problems. However, it serves an
important role in assisting the geotechnical engineer in visu-
alizing anticipated unsaturated soil behavior. In this sense,
the presentation of the rheological simulation model is a
good way to close off the topic and open the way for the
visualization of the many unsaturated soil mechanics prob-
lems still waiting to be solved.
k
a
=
coefficient of permeability with respect to air,
γ
a
=
unit weight of air,
m
1
=
coefficient of air volume change with respect to a
change in net normal stress, and
m
3
=
coefficient of air volume change with respect to a
change in the stress state variable
σ
−
u
a
.
The plot of percent consolidation versus the logarithm of
time is shown in Fig. 16.67. The pore-water pressures in each
layer are presented as a function of the logarithm of time in
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