Geosynthetics June/July 2022 - 21

Case Studies
Improving railway
drainage with multilinear
geocomposites
The authors assert, through three illustrative cases studies,
that significantly improving railway drainage is possible
using multi-linear drainage geocomposites.
By Stephan Fourmont and Mathilde Riot
I
n civil engineering, drainage systems are traditionally made with granular
material layers and perforated collector pipes. The use of drainage geocomposites
became more common 30 years ago with the development of
products that met the specific requirements of each application. Moreover,
the geocomposite is cheaper than the granular material (but provides the
same performance) in most applications. Drainage geocomposites are faster
to install, require less machinery and reduce the greenhouse gas (GHG)
emissions of the project (Durkheim et al. 2010). As with any engineering
solution, engineers must carefully select and design drainage geocomposites
to function for a specific site's conditions. In railway infrastructure, engineers
stipulate using specialized geocomposites for lateral drainage on vertical
wick drains under preloading embankments and directly under the tracks,
to increase the drainage capacity of the ballast, and in cuttings, to intercept
high water tables.
Drainage geocomposites with mini-pipes are used in civil engineering
and, more specifically, in earthworks projects (Figure 1). DRAINTUBE is
a multi-linear drainage geocomposite (terminology as per ASTM D4439)
composed of nonwoven geotextiles that are needlepunched with perforated,
corrugated polypropylene mini-pipes evenly spaced inside and running the
length of the roll. The mini-pipes have two perforations per corrugation at
180˚ and alternating at 90˚(Figure 2 on page 22).
The number of mini-pipes within the geosynthetic drives the drainage
capacity of such geocomposites (Figure 3 on page 22). The distance
in between the mini-pipes and the transmissivity of the overall product
Stephan Fourmont is business
development manager at AFITEXTexel
Geosynthetics Inc. in SainteMarie,
Que., Canada.
Mathilde Riot is technical and
R&D manager at Afitexinov
Geosynthetics in Champhol, France.
All figures courtesy of the authors.
GeosyntheticsMagazine.com
21
http://www.GeosyntheticsMagazine.com

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
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