Geosynthetics June/July 2021 - 16

NPA geocell for a railway line repair in a permafrost region
in May 2016 are shown in Figures 1, 2
and 3.
For infrastructure development in
the permafrost region, innovative design,
sustainable construction methods, and
the protection of the permafrost are
important both for the structural stability
and to protect the permafrost. Surface
melt due to warm temperatures causes
permafrost degradation, and, at the same
time, the subsurface is a frozen, impermeable
medium, meaning the entire melt
becomes surface flow, causing flood damages.
Any design work in this region,
therefore, needs to avoid creating further
problems in the creek crossings as well.
The HBR track in Manitoba was facFIGURE
2 The condition of the railway line in May 2016
FIGURE 3 Washed out
railway line after the
2017 flood event (2018)
ing severe problems caused by the lateral
spreading of the ballast and subballast
material, erosion of the embankment
sides and permafrost degradation. Under
the heavy dynamic loading coming from
train movement, a reliable reinforcement
mechanism that comes through a highstrength
and highly creep-resistant geocell
was needed to reduce the stress transferred
to the subgrade and keep the cover intact
to protect the underlying permafrost.
Twelve of twenty-six damaged locations
were identified along the 34-mile
(55-km) stretch of the track for immediate
repair and were designed with geocell
reinforcement. All twelve locations
had degraded permafrost and needed
culvert pipe installation, as there were
defined streamflow lines. The length of
the washouts ranged from 230 to 689 feet
(70 to 210 m). The repair work included
reinforced embankment construction to
support the structure from dynamic train
loading, installing culverts and erosion
control at the slopes.
The design concepts
Several techniques have been implemented
in Tibet to construct sustainable
transportation infrastructure in the
16
Geosynthetics | June July 2021

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
Geosynthetics June/July 2021 - 10
Geosynthetics June/July 2021 - 11
Geosynthetics June/July 2021 - 12
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Geosynthetics June/July 2021 - 14
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Geosynthetics June/July 2021 - 16
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Geosynthetics June/July 2021 - 19
Geosynthetics June/July 2021 - 20
Geosynthetics June/July 2021 - 21
Geosynthetics June/July 2021 - 22
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Geosynthetics June/July 2021 - 24
Geosynthetics June/July 2021 - 25
Geosynthetics June/July 2021 - 26
Geosynthetics June/July 2021 - 27
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Geosynthetics June/July 2021 - 30
Geosynthetics June/July 2021 - 31
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Geosynthetics June/July 2021 - 35
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Geosynthetics June/July 2021 - 37
Geosynthetics June/July 2021 - 38
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Geosynthetics June/July 2021 - 40
Geosynthetics June/July 2021 - 41
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Geosynthetics June/July 2021 - Cover3
Geosynthetics June/July 2021 - Cover4
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https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-june-july-2021
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