Behaviour of Non-woven Geotextiles for Drainage of Buildings

The filter behaviour of nonwoven geotextiles was investigated. For this purpose three different geotextiles were combined with three selected problem soils. The results of the tests showed, that a line of’lstabilization occurs. This is faster in the case of thick, needle punched nonwoven geotextiles than in the case of thin, heat bonded nonwoven geotex­tiles. In all the tests the permeability normal to the plane (permittivity) decreased by approximately 50%. Comparable re­sults were also obtained in the field tests.