The use of geomembranes in the waterproofing of tunnels for transit systems is commonplace. When used in this application it is important that the geomembrane is effectively protected to avoid damage.
Tunnel constructions must be protected from groundwater from the surrounding rock, this is achieved by waterproofing using polymeric membranes which require protection from damage during the construction phase and continued design life.
GEOfabrics’ HPS geotextiles can be attached to the exposed shotcrete surface to protect the polymeric geomembrane from damage during installation and service. Where drainage is also required for the management of groundwater, GEOfabrics’ specialist composites can be used to provide this additional function.