Geoysynthetics August/September 2023 - 25
recovery rate of about 0.3, and uniform
settlement at the top of the embankment.
Some evaluation methods for determination
of arching in piled embankments
tend to under-predict the loads transferred
to the piles, however, so an SRR
closer to 0.2 or 0.3 was anticipated, particularly
considering the relatively large
height of the fill.
The design converged on two layers
of biaxial geogrid with a combined
stiffness requirement of 30,000 lbs per
foot (440 kN per meter) and allowable
reinforcement strength of 800 to 1,200
lbs per foot (12 to 18 kN per meter) at
2% strain after reductions.
Polymeric geogrid load behavior is
both time and strain dependent. The
calculated ultimate applied load on the
wall included three tracks of live rail loading
equivalent to about 35% of the total
calculated load. The strain induced in
the geogrid mobilizes primarily, however,
from the longer-term service dead
load of the wall and embankment, even
though the tensile strength was required
to meet the ultimate load. The loading
was also only scheduled to be in service for
approximately 14 to 16 months. Therefore,
taking time and dead load into account
the geogrid was designed to act with a
stiffness at only 2% strain, as opposed
to a higher stiffness at 5% strain. Postconstruction
settlement was estimated
at about 1.2 inches (30 centimeters). The
two layers of biaxial grid were installed
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Geoysynthetics August/September 2023
Table of Contents for the Digital Edition of Geoysynthetics August/September 2023
Geoysynthetics August/September 2023 - Cover1
Geoysynthetics August/September 2023 - Cover2
Geoysynthetics August/September 2023 - 1
Geoysynthetics August/September 2023 - 2
Geoysynthetics August/September 2023 - 3
Geoysynthetics August/September 2023 - 4
Geoysynthetics August/September 2023 - 5
Geoysynthetics August/September 2023 - 6
Geoysynthetics August/September 2023 - 7
Geoysynthetics August/September 2023 - 8
Geoysynthetics August/September 2023 - 9
Geoysynthetics August/September 2023 - 10
Geoysynthetics August/September 2023 - 11
Geoysynthetics August/September 2023 - 12
Geoysynthetics August/September 2023 - 13
Geoysynthetics August/September 2023 - 14
Geoysynthetics August/September 2023 - 15
Geoysynthetics August/September 2023 - 16
Geoysynthetics August/September 2023 - 17
Geoysynthetics August/September 2023 - 18
Geoysynthetics August/September 2023 - 19
Geoysynthetics August/September 2023 - 20
Geoysynthetics August/September 2023 - 21
Geoysynthetics August/September 2023 - 22
Geoysynthetics August/September 2023 - 23
Geoysynthetics August/September 2023 - 24
Geoysynthetics August/September 2023 - 25
Geoysynthetics August/September 2023 - 26
Geoysynthetics August/September 2023 - 27
Geoysynthetics August/September 2023 - 28
Geoysynthetics August/September 2023 - 29
Geoysynthetics August/September 2023 - 30
Geoysynthetics August/September 2023 - 31
Geoysynthetics August/September 2023 - 32
Geoysynthetics August/September 2023 - 33
Geoysynthetics August/September 2023 - 34
Geoysynthetics August/September 2023 - 35
Geoysynthetics August/September 2023 - 36
Geoysynthetics August/September 2023 - 37
Geoysynthetics August/September 2023 - 38
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Geoysynthetics August/September 2023 - 40
Geoysynthetics August/September 2023 - 41
Geoysynthetics August/September 2023 - 42
Geoysynthetics August/September 2023 - 43
Geoysynthetics August/September 2023 - 44
Geoysynthetics August/September 2023 - Cover3
Geoysynthetics August/September 2023 - Cover4
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