Woven versus nonwoven geotextiles
Woven versus nonwoven geotextiles
(OP)
Is there someone out there who could explain the applicability of woven versus nonwoven geotextiles? Benefits to each? What types of projects would each be appropriate on?





RE: Woven versus nonwoven geotextiles
advantages - cost, strength, stiffness
disadvantages - easily "opened" by angular aggregate; poor filter, so it may not keep layers separate
Non-woven:
advantages - excellent filtration and separation properties
disadvantages - more expensive than a non-woven (only a little); not as stiff (but can be strengthened and stiffened by making it thicker and reinforcing it)
Do you have a specific application in mind?
Please see FAQ731-376 by VPL for tips on how to make the best use of Eng-Tips Fora.
RE: Woven versus nonwoven geotextiles
Woven fabrics are individual threads (monofilaments, multifilaments or fibrillated yarns) or slit films and tapes that are actually woven on a loom. Typically, they have a very uniform appearance.
Non-woven geotextiles are made using synthetis filaments or fibers that are continuously extruded and spun, blown or placed on a moving belt. These items are then needlepunched or heat bonded into a nonwoven mass.
Typically the non-woven fabrics are used in filter and separation applications. Whereas the wovens can be used for stabiliztion, reinforcement, as well as, filtration and separation. However, the correct nonwoven and woven fabrics must be selected for each individual application.
A very helpful reference on geosynthietis is "Geosynthetic Engineeering" by Robert D. Holtz, Barry R. Christopher and Ryan R. Berg published in 1997 by BiTech Publishers Ltd. in Richmond, British Columbia, Canada. This book is very good at explaining design and selection of geotextile fabrics for various applications.
I hope this helped.
RE: Woven versus nonwoven geotextiles
RE: Woven versus nonwoven geotextiles
RE: Woven versus nonwoven geotextiles
RE: Woven versus nonwoven geotextiles
What happens in a soil environment is that each of the fibers in a nonwoven is closely confined by the soil mass. The in-air properties are very different than in-soil properties. All the inclusions, including bedsheets, behave very stiffly up to very high levels of loading. None of the mathematical models currently in use reflect this. Most are in conservative error by factors up to 20. Yes, 20. We spent over 25 million in research to learn this.
We have built over 200 million dollars worth of GRS features. Walls, abutments, piers, barriers and more No one pays much attention to us. It must be that we use generic materials and designs, counterflow to the proprietary mainstream.
So if you are using grids for stiffness, then why not something that is really stiff like chain link? If you want reinforcement, wovens typically serve best, when cost is a factor. If you want particle restraint, use nonwovens. If you want filtration, you don't understand the question.
RE: Woven versus nonwoven geotextiles
I would be interested in what you are talking about. I wonder if this was state financed research or university? Please let me know where I can find some more information. Also, have you heard of Dr. Bathurst and his research with full scale retaining walls at the Royal Military College (Canada)? He has shown that present design techniques are typically conservative, requiring double the actual required reinforcement.
RE: Woven versus nonwoven geotextiles
I don't say much about this. We are making a lot of money with this knowledge. The shame is that the taxpayers who paid for our education are seeing little benefit.
Check www.yenter.com and www.soilnaillauncher.com