Geosynthetics, friction angle
Geosynthetics, friction angle
(OP)
Does anyone know of any good references for friction angles of geosynthetics? I've checked the manufactures websites, but couldn't find anything. I'm looking for info on geotextile and geomembranes.
The rule of thumb in my office is that geotextile should not be placed on a slope greater than 2H:1V. Is that the industry standard? Any references to back it up?
Thanks for your time!
The rule of thumb in my office is that geotextile should not be placed on a slope greater than 2H:1V. Is that the industry standard? Any references to back it up?
Thanks for your time!
RE: Geosynthetics, friction angle
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RE: Geosynthetics, friction angle
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RE: Geosynthetics, friction angle
As far as the anchor trench goes, check for pull out. Also, in a layered system, work the calculations through the various layers. This will help you find the weak interface, and also tell you if you have over stressed a layer.
I have seen synthetics placed vertically in quarry wall linings, and have seen some that require a 4:1 slope to be marginally stable. In most landfills I have worked around, you will find the maximum slope to be 3:1. Factors to look at include: 1) Will you fill against and buffer the possibility of a slide? 2) Is this a cover system? 3) What is the drainage / sill the soil get saturated? 4) The list goes on.
RE: Geosynthetics, friction angle
TDAA - Changing the subject slightly, is it considered good practice to rely on the tensile strength of the fabric to make a slope stable? I could see using it as "gravy" to show a higher FS for a slope that is at least marginally stable without it.
RE: Geosynthetics, friction angle
Say you have something such as a cover system that generally looks like: trash/dialy cover/synthetic liner/drainage synthetic/soil cover.
When looking at the veneer stability of the system, you have to check each interface, and each will have an associated frictional force. In the example above, it can be likely that the interface between the two synthetics will have a lower frictional force than between the soil and the drainage synthetic. Where this occures, you will get a resultant tensile force. Just draw the FBD for the Drainage synthetic and you will see. Not that this should be used for adding resistance, but it should be checked in a complete design.