Geosynthetics June/July 2021 - 29

flows through a 1-foot (300-mm)
gravel drainage layer between the old
waste and the soil-reinforced layer.
Soil-reinforced layer
A 1.8-foot (550-mm) thick soil-reinforced
layer is required to have a uniform
load distribution over the old waste mass
and limit the differential settlements. It is
composed of:
* Two layers of PVA reinforcement
geosynthetic with an ultimate tensile
strength of 2,570 pounds-force
per inch (450 kN/m) and a maximum
elongation of 6% installed
perpendicularly at two different
levels to fully mobilize the interface
friction angles. The overlaps are
calculated to ensure continuity of
the reinforcement.
* Incinerator bottom ash material
available on-site.
Numerous analyses have been carried
out on the bottom ash material to
characterize its physical, mechanical and
chemical properties (Table 2). It has been
found suitable as a backfill material. The
pH, which may exceed 10, has been considered
when selecting the reinforcement
geosynthetic. PVA material has been
proven to be more adapted for that range
of pH.
Leachate barrier system
The leachate barrier system required by
the French regulation is implemented on
top of the soil-reinforced layer. It is composed
of (from bottom to top):
* A clayey layer 3-foot (0.9-m) thick
with a hydraulic conductivity inferior
to 1 × 10-9 m/s, and a geosynthetic
clay liner (GCL)
* An 80-mil (2-mm) HDPE geomembrane
protected by a nonwoven
geotextile
* A gravel drainage layer 1.6-feet (0.5m)
thick
The barrier system allows the leachate
generated in the new cell to be collected
separately with dedicated collection
wells. The slope of the bottom cell
has been increased to 3% in the drainage
direction to ensure a remaining longterm
slope of 1% after the maximum
expected settlements.
Geosynthetic installation
To limit overlaps, simplify the installation
and ensure the continuity of
the reinforcement, rolls with specific
lengths have been produced. The length
of the product was 395 feet (120 m).
Handling was achieved using mechanical
shovels.
GEOSTAR
Advanced Geomembrane Welders
GEOSTAR with LQS - Automatic Data Acquisition, Enhanced QC/QA
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We know how.
www.GeosyntheticsMagazine.com
29
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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
Geosynthetics June/July 2021 - 10
Geosynthetics June/July 2021 - 11
Geosynthetics June/July 2021 - 12
Geosynthetics June/July 2021 - 13
Geosynthetics June/July 2021 - 14
Geosynthetics June/July 2021 - 15
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
Geosynthetics June/July 2021 - 22
Geosynthetics June/July 2021 - 23
Geosynthetics June/July 2021 - 24
Geosynthetics June/July 2021 - 25
Geosynthetics June/July 2021 - 26
Geosynthetics June/July 2021 - 27
Geosynthetics June/July 2021 - 28
Geosynthetics June/July 2021 - 29
Geosynthetics June/July 2021 - 30
Geosynthetics June/July 2021 - 31
Geosynthetics June/July 2021 - 32
Geosynthetics June/July 2021 - 33
Geosynthetics June/July 2021 - 34
Geosynthetics June/July 2021 - 35
Geosynthetics June/July 2021 - 36
Geosynthetics June/July 2021 - 37
Geosynthetics June/July 2021 - 38
Geosynthetics June/July 2021 - 39
Geosynthetics June/July 2021 - 40
Geosynthetics June/July 2021 - 41
Geosynthetics June/July 2021 - 42
Geosynthetics June/July 2021 - 43
Geosynthetics June/July 2021 - 44
Geosynthetics June/July 2021 - Cover3
Geosynthetics June/July 2021 - Cover4
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-december-2021-january-2022
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-october-november-2021
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-august-september-2021
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-june-july-2021
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-april-may-2021
https://www.nxtbook.com/ifai/geosynthetics/geosynthetics-february-march-2021
https://www.nxtbook.com/ifai/geosynthetics/1220GS
https://www.nxtbook.com/ifai/geosynthetics/1020GS
https://www.nxtbook.com/ifai/geosynthetics/0820GS
https://www.nxtbook.com/ifai/geosynthetics/0620GS
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https://www.nxtbook.com/ifai/geosynthetics/0419GS
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