Geosynthetic composite for filtration and drainage of fine-grained geomaterials

摘要

A geocomposite with a geonet and a geotextile. The geotextile has a nonwoven fabric layer and a woven fabric layer, with the nonwoven fabric connected by needle-punching to the woven fabric whereby fibers of the nonwoven fabric extend through and beyond the woven fabric, and the woven fabric and fibers of the nonwoven fabric extending through the woven fabric are bonded to one side of the geonet.

主权项

1. A geocomposite for use in a geotechnical project site, comprising:
(a) a geotextile for cross-plane filtering comprising:
a primary layer consisting of a first nonwoven fabric with opposite faces and having an apparent opening size (AOS) at least about 0.180 mm and a thickness greater than about 1.0 mm at 2 kPa normal load;a secondary layer consisting of a first woven fabric with opposite faces and having about 2% to 20% open area and an AOS between about 0.074 mm and 0.841 mm;wherein
one of the opposite faces of said first nonwoven fabric is directly against one of the opposite faces of said first woven fabric, said first nonwoven fabric connected to said first woven fabric by needle punching whereby fibers of said first nonwoven fabric are punched into said first woven fabric to extend through said one opposite face of said first woven fabric, andsaid first nonwoven fabric and first woven fabric when connected have an apparent opening size (AOS) less than about 0.106 mm and a combined permeability greater than 0.1 cm/sec; and(b) a qeonet connected on one side to the other of the opposite faces of the first woven fabric.