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At present, there are inadequate recommendations to guide the design engineer in the selection of protection geotextiles in association with geomembranes. Current recommendations generally rely on elaborate field experiments or costly laboratory studies. A relieable engineering assessment method that will yield useful puncture values is not currently available. With the pyramid puncture test, however, testing is possible on geomembranes and protective nonwoven geotextiles to determine the magnitude of the protection provided by geotextiles.
The test apparatus consists mainly of a pyramid piston, an underlaying media and a test press. The test specimens can be tested unclamped or clamped between rings. An electric circuit is applied between the piston and the underlying media to indicate the puncture force at the point of perforation.
Puncture resistance, electrical circuit, pyramid piston, geomembrane protection
Technical Consultant, Polyfelt Ges.m.b.H., Linz,