Geosynthetics June/July 2021 - 19

show the construction sequence of the
repair work: track cutting and removal,
geocell installation, gravel compaction
and reinstalled rail track.
Geocell was stretched and installed at
the site with guide stakes. The requirement
of more than one layer of the geocell
was decided on-site wherever there
was more than 29.5 inches (750 mm)
of fill required between two layers. The
railway track was cut and set aside to
allow the installation of the geocell and
to construct the embankment. When the
embankment was ready, it was lifted back
into position and connected.
Discussion
Sustainable construction can be achieved
by appropriately choosing the technology
and using innovative ideas. Reusing
the washed-out material can reduce the
burden on environment and save money
and time. As pointed out in the preceding
sections, the design in this project not
only considered the strength requirement
but also gave due consideration to the
environment. The design had to balance
protecting the permafrost, controlling the
lateral spreading and embankment side
erosion, and strengthening the subballast
structure to bear the railway traffic
load. The use of available aggregate from
the washed-out locations reduced about
50% of the virgin aggregate extraction
and lessened the need for hauling and
stockpiling burdens. The innovative geocell
design, unlike the traditional design
approach, provided the required structural
strength by confinement of poorly
graded granular material, and reused
the washed-out material. It saved a huge
amount of virgin aggregate extraction
and carbon emission that would have
happened due to hauling and mining
virgin aggregate from a far-off location.
This was made possible by using geocells
as reinforcement.
FIGURE 4 The track removal and geosynthetics installation for the repair work
FIGURE 5 Geocell installation above
the existing subgrade
FIGURE 6 Compaction after granular
aggregate infill in geocell
FIGURE 7 Geocell installation for
subballast reinforcement
FIGURE 8 The rails are connected, and the section is ready for ballast fill.
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Geosynthetics June/July 2021

Table of Contents for the Digital Edition of Geosynthetics June/July 2021

Geosynthetics June/July 2021 - Cover1
Geosynthetics June/July 2021 - Cover2
Geosynthetics June/July 2021 - 1
Geosynthetics June/July 2021 - 2
Geosynthetics June/July 2021 - 3
Geosynthetics June/July 2021 - 4
Geosynthetics June/July 2021 - 5
Geosynthetics June/July 2021 - 6
Geosynthetics June/July 2021 - 7
Geosynthetics June/July 2021 - 8
Geosynthetics June/July 2021 - 9
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Geosynthetics June/July 2021 - 11
Geosynthetics June/July 2021 - 12
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Geosynthetics June/July 2021 - 16
Geosynthetics June/July 2021 - 17
Geosynthetics June/July 2021 - 18
Geosynthetics June/July 2021 - 19
Geosynthetics June/July 2021 - 20
Geosynthetics June/July 2021 - 21
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Geosynthetics June/July 2021 - 35
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Geosynthetics June/July 2021 - Cover3
Geosynthetics June/July 2021 - Cover4
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