Geosynthetics February/March 2024 - 11
PLY-ADHESION VALUES FOR
TRIPLANAR GEOCOMPOSITES
Q: Is there a minimum ply-adhesion value for a
triplanar geocomposite? I ask this knowing that
GRI-GN4 (Test Methods, Required Properties
and Testing Frequency for Biplanar Geonets and
Biplanar Geonet Composites) specification states
a minimum of 1.0 pound/inch.
A: Yes, the minimum ply-adhesion value of 1.0 ppi
is a pretty good number for triplanar and biplanar
geocomposites. Please see the attached figure at
right of shear strength versus peel strength, which
confirms this opinion. The figure is from years of
data collected by the Geosynthetic Institute (GSI)
at various sites with many different products.
That written, this is certainly not the whole answer,
particularly if you are designing on the West
Coast in the U.S. If seismic issues exist with steep
slope, please consult R. Thiel's 2023 keynote address
from the 12th ICG in Rome, Italy, for a more
complete answer:
Thiel, R. (2013). " Selection of long-term shear strength parameters
for geosynthetic interfaces. " Proc., 12th International
Conf. on Geosynthetics, Rome, Italy, www.12icg-roma.org.
GSI's Peel vs Shear Strength
GT on GC, Saturated, 44,114 & 228 psf (2, 5.5 & 11 kPa) Normal Pressure
0.5
1.5
2.5
3.5
1
2
3
-0.5
10
y = 0.0028x2 - 0.05x + 0.01
20
30
Peak Friction Angle (degrees)
1 ppi = 5.7 kN/m
40
50
GeosyntheticsMagazine.com
11
Peel Strength (ppi)
http://www.12icg-roma.org
http://www.layfieldgeo.com
http://www.GeosyntheticsMagazine.com
Geosynthetics February/March 2024
Table of Contents for the Digital Edition of Geosynthetics February/March 2024
Geosynthetics February/March 2024 - Cover1
Geosynthetics February/March 2024 - Cover2
Geosynthetics February/March 2024 - 1
Geosynthetics February/March 2024 - 2
Geosynthetics February/March 2024 - 3
Geosynthetics February/March 2024 - 4
Geosynthetics February/March 2024 - 5
Geosynthetics February/March 2024 - 6
Geosynthetics February/March 2024 - 7
Geosynthetics February/March 2024 - 8
Geosynthetics February/March 2024 - 9
Geosynthetics February/March 2024 - 10
Geosynthetics February/March 2024 - 11
Geosynthetics February/March 2024 - 12
Geosynthetics February/March 2024 - 13
Geosynthetics February/March 2024 - 14
Geosynthetics February/March 2024 - 15
Geosynthetics February/March 2024 - 16
Geosynthetics February/March 2024 - 17
Geosynthetics February/March 2024 - 18
Geosynthetics February/March 2024 - 19
Geosynthetics February/March 2024 - 20
Geosynthetics February/March 2024 - 21
Geosynthetics February/March 2024 - 22
Geosynthetics February/March 2024 - 23
Geosynthetics February/March 2024 - 24
Geosynthetics February/March 2024 - 25
Geosynthetics February/March 2024 - 26
Geosynthetics February/March 2024 - 27
Geosynthetics February/March 2024 - 28
Geosynthetics February/March 2024 - 29
Geosynthetics February/March 2024 - 30
Geosynthetics February/March 2024 - 31
Geosynthetics February/March 2024 - 32
Geosynthetics February/March 2024 - 33
Geosynthetics February/March 2024 - 34
Geosynthetics February/March 2024 - 35
Geosynthetics February/March 2024 - 36
Geosynthetics February/March 2024 - 37
Geosynthetics February/March 2024 - 38
Geosynthetics February/March 2024 - 39
Geosynthetics February/March 2024 - 40
Geosynthetics February/March 2024 - 41
Geosynthetics February/March 2024 - 42
Geosynthetics February/March 2024 - 43
Geosynthetics February/March 2024 - 44
Geosynthetics February/March 2024 - Cover3
Geosynthetics February/March 2024 - Cover4
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