Geosynthetics April/May 2020 - 9
load transfer (Figures 1a and 1b), and
there is no geotextile intrusion or creep
over time.
Laboratory test data on a multilinear
drainage geocomposite demonstrates
that the transmissivity of the product is
neither load nor time sensitive. When the
product is properly confined, increasing
the normal load does not significantly
affect the transmissivity at loadings up to
50,000 pounds per square foot (244,000
kg/m2). Additionally, test data indicates
no change in transmissivity over the
first 1,000 hours (Blond, Fourmont and
Saunier 2013).
Multiple studies were performed
on the long-term transmissivity of biological clogging of a multilinear drainage geocomposite. Over an 18-month
test program, neither the geotextile
filter nor the mini-pipe of a multilinear drainage geocomposite treated
with non-leachable, silver-based biocide treatment appeared to clog, and it
exhibited the same or better long-term
hydraulic behavior than the gravel layer
(Fourmont and Koerner 2017).
Additionally, over a three-year test
program that simulated in-landfill conditions, the residual long-term flow capacity of a multilinear drainage geocomposite (designated as NWNP w TUBE
Applications
in Figure 2 on page 10) was about 75%,
whereas a typical single-sided geonet
geocomposite (designated as NWNP w
GN in Figure 2 on page 10) was about
30% (Saunier, Steinhauser and Fourmont
2017 and GRI Standard 2013).
As expected, the transmissivity of a
multilinear drainage geocomposite is
proportional to the number of pipes per
unit width. In other words, the properties
that are measured on one pipe and calculated for a unit width of 1 meter (3.28
feet) can be multiplied by the number of
pipes per unit width to find the transmissivity of a product with an increased
number of pipes.
FIGURE 1A Pipe/backfill load transfer
FIGURE 1B Soil arching effect
1a
Pipe/Backfill Load Transfer
Type of Geocomposite
Landfill Leachate Collection
Retaining Walls
Sport Fields
Landfill Covers
Geonet
RFCR6
1.4 to 2.0
DRAINTUBE®
1.0
Geonet
1.2 to 1.4
DRAINTUBE®
1.0
Geonet
1.0 to 1.5
DRAINTUBE®
1.0
Geonet
1.1 to 1.4
DRAINTUBE®
1.0
1b
Soil Arching Effect
Requirement
RFCC5
RFBC5
1.5 to 2.0
1.1 to 1.5
1.0 to 1.2
1.0 to 1.2
1.1 to 1.3
RFGI6
1.5 to 2.0
1.0* to 1.3
1.0
1.0 to 1.2
1.3 to 1.5
1.0* to 1.2
1.0
1.1 to 1.3
1.0 to 1.2
1.0* to 1.3
1.0
1.2 to 3.5
1.3 to 1.5
1.0* to 3.5
1.0
* In cases when using DRAINTUBE® ACB, which contains a non-leachable, silver based biocide treatment
TABLE 1 Typical RF factors for geonet and multilinear drainage geocomposites
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