Geotextile selection
Geotextile selection
(OP)
I need some ideas on the selection of a geotextile for specific purposes. We have oil and gas pipelines crossing active faults, and the pipelines will be buried, contrary to advice to put them above ground, but that's another topic. The trench bottom will be lined with a granular layer, then a geotextile. The trench backfill will be expanded clay/shale, which will allow the pipes to flex during a seismic event. It is important to prevent any contamination getting into the lightweight fill, and so the geotextile should only allow water through. Many of the fault crossings are areas of high groundwater.





RE: Geotextile selection
RE: Geotextile selection
AASHTO Specs - Table 1
Table 1 lists the M288-96 default geotextile class and design class for the subsurface drainage, permanent erosion control, separation and stabilization applications.
TABLE 1. DEFAULT GEOTEXTILE CLASSES FOR M288-96
Application Class Default Class Design
Subsurface Drainage Class 2 Class 3
Permanent Erosion Control Class 2 for woven monofilaments Class 2
Class 1 for all others
Separation Class 2 Class 3
Stabilization Class 1 Class 2 or 3
Engineering is the practice of the art of science - Steve
RE: Geotextile selection
RE: Geotextile selection