Geosynthetics October/November 2022 - 33

Conclusions
It is important to properly design the
waterproofing and drainage system of a
tunnel to preserve its durability but also
the safety and the durability of its internal
spaces and technological systems. Yet
this objective cannot be reached with
the use of a single geomembrane alone.
Rather, meeting this objective requires
a waterproofing system, where the geomembrane
is one important component.
The choice and the correct design of an
appropriate waterproofing system is the
basis of a good and safe project.
Another important component
in combination with the PVC-P geomembrane
is the protection/drainage
layer made by a geocomposite that must
be compatible and properly work in combination
with the PVC-P geomembrane.
To ensure a proper draining-protection
effect to a tunnel waterproofed with a
PVC geomembrane, it is recommended to
install a drainage geocomposite between
the geomembrane and the gunite layer.
References
Bieniawski, Z. T. (1976). Rock mass classification in rock
engineering. In Exploration for rock engineering, proc.
of the symp. (ed. Z. T. Bieniawski). Balkema, Cape Town.
Bieniawski, Z. T. (1989). Engineering rock mass
classifications. Wiley, New York.
Cazzuffi, D., and Recalcati, P. (2018). " Recent
developments on the use of drainage geocomposites
in capping systems. " Detritus-Multidisciplinary
Journal for Waste Resources & Residues, 3 (2018),
93-99.
Cunegatti, M. (2019). " European practice on the
use of PVC-P geomembranes in tunnels and
underground structures - special testable and
reparable waterproofing systems. " Proc., Pan American
Conference on Soil Mechanics and Geotechnical
Engineering, Cancun, Mexico, 1279-1285.
Terzaghi, K. (1946). " Rock defects and loads on tunnel
supports. " In Rock tunnelling with steel supports, (eds.
R. V. Proctor and T. L. White). Commercial Shearing and
Stamping Co., Youngstown, OH. G
FIGURE 8 Tunnel after geomembrane installation
>> For more, search " drainage geocomposites "
at GeosyntheticsMagazine.com.
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Geosynthetics October/November 2022

Table of Contents for the Digital Edition of Geosynthetics October/November 2022

Geosynthetics October/November 2022 - Cover1
Geosynthetics October/November 2022 - Cover2
Geosynthetics October/November 2022 - 1
Geosynthetics October/November 2022 - 2
Geosynthetics October/November 2022 - 3
Geosynthetics October/November 2022 - 4
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Geosynthetics October/November 2022 - cover3
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Geosynthetics October/November 2022 - GeoConf Brochure 1
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