Difference between revisions of "Geotextiles"

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<ul><li>Material specifications should conform to Ontario Provincial Standard Specification (OPSS) 1860 for Class II geotextile fabrics.</li>
<ul><li>Material specifications should conform to [http://www.raqsb.mto.gov.on.ca/techpubs/OPS.nsf/0/2ccb9847eb6c56738525808200628de1/$FILE/OPSS%201860%20Apr12.pdf Ontario Provincial Standard Specification (OPSS) 1860 for Class II geotextile fabrics].</li>
<li>Fabrics should be woven monofilament or non-woven needle punched. Woven slit film and non-woven heat bonded fabrics should not be used as they are prone to clogging.</li>
<li>Fabrics should be woven monofilament or non-woven needle punched. Woven slit film and non-woven heat bonded fabrics should not be used as they are prone to clogging.</li>
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Revision as of 12:21, 5 July 2017

Primary considerations are:

  1. Maximum forces that will be exerted on the fabric (i.e., what tensile, tear and puncture strength ratings are required?);
  2. Load bearing ratio of the underlying native soil (i.e. is the geotextile needed to prevent downward migration of aggregate into the native soil?);
  3. Texture (i.e., grain size distribution) of the overlying fill material; and
  4. Permeability of the native soil
  5. Suitable apparent opening size (AOS) for non-woven fabrics, or percent open area (POA) for woven fabrics, to maintain water flow even with sediment and microbial film build-up;
Recommended criteria for selection of geotextile fabric
Percent media passing 0.075 mm (#200 sieve)Non-woven fabric apparent opening size (AOS, mm)Woven fabric percent open area (POA, %)Permittivity (sec-1)
>85≤ 0.3Not recommended0.1
50 - 85≥ 4
15 - 50≤ 0.60.2
5 - 150.5
≤ 5≥ 10