Geosynthetics June/July 2022 - 23

wide. The subgrade was composed of
loess in the first 13 feet (4 m), sandy soil
from 13 feet (4 m) to 21 feet (6.5 m),
then clayey soil from 21 feet (6.5 m) to
36 feet (11 m).
Engineers estimated settlements to
be between 1.5 and 3.5 inches (40 to 90
mm). The length of the vertical drains
was set at 36 feet (11 m) with a square
grid of 4 × 4 feet (1.2 × 1.2 m).
After removing the topsoil layer,
crews drove vertical wick drains into the
ground. Workers subsequently unrolled
the drainage geocomposite perpendicularly
to the railway line while also
overlapping the wick drains (Figure 5).
The geocomposite's mini-pipes have
a diameter of 0.8 inch (20 mm) and a
spacing of 20 inches (510 mm) centerto-center.
The geocomposite collects the
water from the wick drains and drains it
to ditches on each side of the embankment.
The backfill was placed directly
on the drainage geocomposite to the
final level.
Monitoring settlements
Engineers monitored the embankment
subbase using profilometers to measure
settlements over time and to choose the
right moment to remove the overload.
The measured settlements did not
exceed 1.6 inches (40 mm), which was
lower than the estimated limit; in addition,
the effective consolidation time
was about three months. The use of a
multi-linear drainage geocomposite for
horizontal drainage instead of a granular
layer offered consistent performance
and reduced the cost of the preloading
embankment construction, as granular
material would have been extracted and
transported to the site, resulting in heavy
truck traffic in and around the worksite.
In comparison, one full truck can carry
enough of the drainage geocomposite
material to cover an area of approximately
108,000 square feet (10,000 m2);
FIGURE 4 Graph of hydraulic transmissivity of the geocomposite under load over time
FIGURE 5 Installation of the vertical wick drains followed by DRAINTUBE
GeosyntheticsMagazine.com
23
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Geosynthetics June/July 2022

Table of Contents for the Digital Edition of Geosynthetics June/July 2022

Geosynthetics June/July 2022 - Cover1
Geosynthetics June/July 2022 - Cover2
Geosynthetics June/July 2022 - 1
Geosynthetics June/July 2022 - 2
Geosynthetics June/July 2022 - 3
Geosynthetics June/July 2022 - 4
Geosynthetics June/July 2022 - 5
Geosynthetics June/July 2022 - 6
Geosynthetics June/July 2022 - 7
Geosynthetics June/July 2022 - 8
Geosynthetics June/July 2022 - 9
Geosynthetics June/July 2022 - 10
Geosynthetics June/July 2022 - 11
Geosynthetics June/July 2022 - 12
Geosynthetics June/July 2022 - 13
Geosynthetics June/July 2022 - 14
Geosynthetics June/July 2022 - 15
Geosynthetics June/July 2022 - 16
Geosynthetics June/July 2022 - 17
Geosynthetics June/July 2022 - 18
Geosynthetics June/July 2022 - 19
Geosynthetics June/July 2022 - 20
Geosynthetics June/July 2022 - 21
Geosynthetics June/July 2022 - 22
Geosynthetics June/July 2022 - 23
Geosynthetics June/July 2022 - 24
Geosynthetics June/July 2022 - 25
Geosynthetics June/July 2022 - 26
Geosynthetics June/July 2022 - 27
Geosynthetics June/July 2022 - 28
Geosynthetics June/July 2022 - 29
Geosynthetics June/July 2022 - 30
Geosynthetics June/July 2022 - 31
Geosynthetics June/July 2022 - 32
Geosynthetics June/July 2022 - 33
Geosynthetics June/July 2022 - 34
Geosynthetics June/July 2022 - 35
Geosynthetics June/July 2022 - 36
Geosynthetics June/July 2022 - 37
Geosynthetics June/July 2022 - 38
Geosynthetics June/July 2022 - 39
Geosynthetics June/July 2022 - 40
Geosynthetics June/July 2022 - 41
Geosynthetics June/July 2022 - 42
Geosynthetics June/July 2022 - 43
Geosynthetics June/July 2022 - 44
Geosynthetics June/July 2022 - Cover3
Geosynthetics June/July 2022 - Cover4
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