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Figure 8
Strain of the geotextile C-C.
because the frost heave was partially counteracted by the compressive
deformation of back unfrozen soil.
The experimental study indicated that the in the reinforced wall geotextile
applied a restraining pressure to the backfill, and the restraining pressure partially
reduced the horizontal frost heave. But it is not necessary that the restraining
pressure is as large as or approximate to the “suspended pressure” in order to
reduce frost heave. Unfrozen soil will be compressed by the restraining pressure
of reinforcement produced by frost heaving of freezing soil, and the frost heave
will be partially counteracted by compressive deformation of unfrozen soil.
Therefore, under the condition of comparatively small restraining pressure, the
frost-heaving displacement of structure can be reduced greatly (Chen Lun et al.,
1996).
3 ANALYSIS METHOD
3.1 A New Method for Analysis of Reinforced Earth
Generally, there are two approaches in the analysis of reinforced soil. One deals
with soil and reinforcement separately, assuming that they interact with each
other through the friction on the interface between them. The other considers the
reinforced soil as an anisotropy homogenous composite, so that the interaction
force between soil and reinforcement becomes an internal force, which does not
appear in the calculation of stress and deformation of the composite. However, in
the former approach, at least three constitutive models of soil, reinforcement, and
interface are necessary, and many relative parameters have to be used and
determined, so the calculation would be very complex when soil is densely
reinforced. The shortcoming of the latter approach is that the reinforced soil is
anisotropy, which makes its calculation even more difficult. It is also very
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