Geoscience Reference
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Figure 5 Displacement vectors in a vertical plane measured on Sections 6 and 12.
(See Fig. 3 for key.)
when the slope becomes b
¼
29
8;
which roughly equals 45
2
f
=
2(f
¼
mobilized angle of friction).
7 CREEP AND CONSOLIDATION
From all the evidence, displacements increase during construction and for some
time after construction has been completed. This is typical of high structures, for
which the effects of the weight of the added fill exceed those of compaction.
During this time a flow of strains and stresses moves from the compacted soil to
the reinforcements. Because the two components of displacement, vertical and
horizontal, are quite similar, no significative volume change are involved in this
process, so that it appears to be result of a creeplike deformation. This creep
refers to the overall structural behavior of the reinforced soil and is not
necessarily linked to the creep of the polymer of reinforcements. The latter would
be rather activated by the overall structure deformation, once its displacements
and strains exceed a certain yield value. This suggests the need for an advanced
prediction of the actual behavior of the structure and of its expected maximum
displacement. This may help determine the final strains on the reinforcements and
the actual factor of safety.
 
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