Geosynthetics June/July 2021 - 23

Case Study
Design of reinforcement
geosynthetics in landfill
piggyback expansion
By Jean-Baptiste Duquet, Cédric Sarbach and Stephan Fourmont
A
n operator at a nonhazardous waste storage facility proposed extending
the facility's life, within the existing perimeter, by vertically expanding
the cells in operation to a maximum thickness of waste of 52.5 feet (16 m).
This project is based on nonhazardous waste storage cells 49.2-feet (15-m)
thick, some of which are more than 20 years old and, therefore, are at different
degradation stages.
The vertical expansion requires the new cell to be hydraulically independent
of those in place underneath. The overall leachate barrier system must
comply with current regulations and must remain functional in the long term.
The design included the installation of a soil layer reinforced with geosynthetics
over the old final cover system (Figure 1). This layer is becoming the
subgrade soil for the new leachate barrier system. Two typical sections are
shown in Figure 2. As the site also operates as a valorization and disposal site
for incinerator bottom ash, it was decided to use this material to construct
the soil-reinforced layer.
Geotechnical design
In addition to the slope stability considerations and design, the vertical expansion
of the cell requires a specific analysis to estimate the overall settlements
that will occur.
Global settlements
Global settlements in waste result from complex phenomena that occur over
time. They can be determined by adding up:
* Primary settlements caused by the weight of the new waste (short term)
* Residual secondary settlements due to the nonhomogeneous degradation
of the old waste (long term)
PROJECT HIGHLIGHTS
REINFORCEMENT IN
LANDFILL PIGGYBACK
EXPANSION
LOCATION
France
DESIGN ENGINEER
Antea Group
GEOSYNTHETICS PRODUCT
GEOTER F PVA 450
GEOSYNTHETICS MANUFACTURER
Afitexinov
Jean-Baptiste Duquet is development
manager infrastructure for Antea
Group in Olivet, France.
Cédric Sarbach is geotechnical
engineer for Afitexinov in
Champhol, France.
Stephan Fourmont is business
development manager-east for
AFITEX-Texel in Sainte-Marie,
Que., Canada.
All figures courtesy of the authors.
www.GeosyntheticsMagazine.com
23

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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
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