CEMP-E
TI 850-02
AFMAN 32-1125(I)
1 MARCH 2000
11. GEOTEXTILES.
a. Application under Track. Geotextiles are sometimes used under the track to provide for filtration
locations for the installation of a geotextile under track are:
(1) Highway-railroad grade crossings.
(2) Locations with poor subgrade.
(3) When rebuilding track with a history of excessive loss of profile (surface) and frequent track
maintenance requirements.
(4) Turnouts. (See figure 6-18).
(5) Bridge approaches. (See figure 6-19).
(6) Rail crossings.
Recent industry studies have shown that geotextiles have not always been effective under track. Thus,
before deciding to install a geotextile, a thorough analysis of the site must be done to assure that a
geotextile will accomplish its intended purpose.
Figure 6-18. Geotextile Installation under a Turnout
6-26
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