Tunnels and Underground


Underground tunnels are created to serve demanding projects i.e. to support road highways that cut through mountains. Due to the existence of ground water, tunnel walls are typically lined with waterproof membrane layers which require high protection from potential damage that can be caused by construction operations.


Thrace Group PNW Needle-punched Nonwoven geotextile series can be used as protective layers for lining systems, offering superior mechanical properties of tensile strength/elongation, static puncture as well as perforation resistance.


  • High protection of waterproof membrane
  • Long-term resistance to alkaline media

Nonwoven Geotextiles

Product Name Tensile Strength MD Tensile Strength CD Resistance to Static Puncture Water Flow Rate
P400NW 25 kN/m 33 kN/m 5000 N 40 l/m2/sec
P500NW 30 kN/m 44 kN/m 6200 N 35 l/m2/sec
P600NW 35 kN/m 52 kN/m 7400 N 30 l/m2/sec
P800NW 45 kN/m 75 kN/m 10000 N 25 l/m2/sec
P1000NW 60 kN/m 95 kN/m 11500 N 20 l/m2/sec
P1200NW 67 kN/m 105 kN/m 14000 N 20 l/m2/sec
P2000NW 100 kN/m 150 kN/m 25000 N 7 l/m2/sec
P1600NW 80 kN/m 125 kN/m 21000 N 10 l/m2/sec