Difference between revisions of "Geotextiles"

From LID SWM Planning and Design Guide
Jump to navigation Jump to search
Line 1: Line 1:
Material specifications should conform to [http://www.raqsb.mto.gov.on.ca/techpubs/OPS.nsf/0/2ccb9847eb6c56738525808200628de1/$FILE/OPSS%201860%20Apr12.pdf Ontario Provincial Standard Specification (OPSS) 1860 for Class II geotextile fabrics].
Material specifications should conform to [http://www.raqsb.mto.gov.on.ca/techpubs/OPS.nsf/0/2ccb9847eb6c56738525808200628de1/$FILE/OPSS%201860%20Apr12.pdf Ontario Provincial Standard Specification (OPSS) 1860 for Class II geotextile fabrics].
*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.
*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.
<p>Primary considerations are:
<p>Primary considerations are:
<ol>
<ol>
Line 9: Line 10:
<li>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;</li>
<li>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;</li>
</ol>
</ol>
 
<br>
<table class = "table-responsive">
<table class = "table-responsive">
<table class="table table-striped">
<table class="table table-striped">
Line 20: Line 21:
   <tr><td align="center" valign="middle">≤ 5</td><td align="center" valign="middle">≤ 0.6</td><td align="center" valign="middle">≥ 10</td><td align="center" valign="middle">0.5</td></tr>
   <tr><td align="center" valign="middle">≤ 5</td><td align="center" valign="middle">≤ 0.6</td><td align="center" valign="middle">≥ 10</td><td align="center" valign="middle">0.5</td></tr>
</table>
</table>
{{:Feedback}}
 
[[category:materials]]
[[category:materials]]

Revision as of 13:56, 6 July 2017

Material specifications should conform to Ontario Provincial Standard Specification (OPSS) 1860 for Class II geotextile fabrics.

  • 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.

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≤ 0.3-0.1
50 - 85≤ 0.3≥ 40.1
15 - 50≤ 0.6≥ 40.2
5 - 15≤ 0.6≥ 40.5
≤ 5≤ 0.6≥ 100.5