Do any list members have an opinion on whether a 90% seam strength
efficiency (wide width tensile strength) is an unreasonably high expectation
for a geotextile with a basic wide width tensile strength of 105 kN/m (600
lb./in)? Either sewn or bonded seams would be permitted.
This is for a permanent (75 to 100 years) support for a structure.
I am aware that sewn seam strength efficiency drops off with increasing
geotextile strength, based on Koerner's Designing With Geosynthetics, 3rd
edition (1994), Article 2.3.3.4. It appears from his Figure 2.11 that the
efficiency decrease becomes quite significant above 1000 lb./in, which is
above my range.
I do not know whether this is equally true for bonded seams, or if sewing
techniques have improved lately.
Any thoughts or comments would be appreciated.
Thanks.
Michael R. Bleakney, P. Eng.
Geotechnical Engineer
New Brunswick Department of Transportation
Structures and Materials Branch
PO Box 6000
Fredericton, New Brunswick
CANADA
E3B 5H1
Tel: (506) 453-2674
Fax: (506) 457-6714
Email: [log in to unmask] <mailto:[log in to unmask]>
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