Geosynthetics June/July 2022 - 22

Improving railway drainage with multi-linear geocomposites
(Blond et al. 2013 and GRI GC15 2017)
have a linear relationship. From Saunier
et al. (2010), it has been shown that the
flow capacity of a drainage geocomposite
is not load or time sensitive when
confined in soil. Figure 4 shows hydraulic
transmissivity test results (per ASTM
D4716) that have been carried out on
top of the product when compressed
under a load of 50,000 psf (2,400 kPa),
which correlates to a 390 foot (120 m)
high soil embankment.
Mechanical properties of the drainFIGURE
2 Diagram of DRAINTUBE multi-linear drainage geocomposite
age geocomposite must be selected as
a function of the drainage application,
the installation conditions and the soil
in which the product is in contact. The
multi-linear drainage geocomposite is
made with adapted short staple fiber geotextiles,
from 3 ounces per square yard to
26 ounces per square yard (100 to 900 g/
m2) or higher. The elongation at break of
the geocomposite is always greater than
50% (ASTM D4632), making it flexible
enough to provide a good connection
with the subgrade soil when installed.
The mini-pipes have a pipe stiffness at
5% deflection over 435 psi (3,000 kPa)
(ASTM D2412).
FIGURE 3 Unrolling of the
DRAINTUBE geocomposite
PROJECT HIGHLIGHTS
RAILWAY DRAINAGE WITH SOFT SOILS
OWNER
RFF/SNCF
LOCATION
France
GENERAL CONTRACTOR
Razel
ENGINEERS
Terrasol
GEOSYNTHETIC PRODUCT
DRAINTUBE FTF2 D20
GEOSYNTHETIC MANUFACTURER
Afitexinov Geosynthetics
22
Geosynthetics | June July 2022
Case study: Railway
drainage with soft soils
One of the high-speed lines (in French,
" Ligne à Grande Vitesse [LGV] " ) constructed
in France in 2008 (LGV RhinRhône)
crossed numerous compressible
areas and bridges that required the
construction of preloading embankments
in conjunction with surcharging
to accelerate the expected settlements
of the subgrade. These preloading
embankments included vertical wick
drains with a multi-linear drainage
geocomposite on top as a horizontal
drainage base layer. The major preloading
embankments were 25 feet (7.5 m)
high and more than 130 feet (40 m)

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
Geosynthetics June/July 2022 - 2
Geosynthetics June/July 2022 - 3
Geosynthetics June/July 2022 - 4
Geosynthetics June/July 2022 - 5
Geosynthetics June/July 2022 - 6
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Geosynthetics June/July 2022 - Cover3
Geosynthetics June/July 2022 - Cover4
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