Table E4. Observations of test section performance made during and after trafficking on the pentagonal loop trail.
Rut depths after
trafficking
Test section
(left/right) No. of passes
Comments/observations
Chunkwood
24.5/15.5
Road spread about 4 ft during trafficking. In-situ soil is exposed on the inside rut and
slightly exposed on the outside rut.
all
Woodchunks ride up on inside track (of tank).
10
Inside corner is below original soil surface.
30
Tank bottomed out on rest of passes.
Tire chips
18/16.5
Road spread about 4 ft during trafficking. The tire chips are mixed in with chunk-
wood and soil.
The wood chunks were carried forward by the tank onto this test area.
Tire chips getting into the tank track.
4+
Slash
24/14
Tank pushed slash into the ground. Very little slash is left on the inside rut. The out-
side rut andthe flat have slash left. The tank obviously bellied out in this area.
Original soil surface is exposed on inside path.
10
Tire mats
not app.
Mats were completely displaced during trafficking. Some metal ties are broken and
tires were cut by the broken wires. Some tires are cracked, and at least three mats lie
perpendicular to the trail.
18
Mat became lodged in the fender.
all
Many wires were broken and posed a hazard to the tank track.
Polyrock w/gravel
32/25
Material is badly torn on the inside rut, but it is intact in the outside rut. In-situ soil is
obviously excavated on the inside rut. Road spread at least 2 ft during trafficking
Polyrock was exposed on inside corner.
10
Belly of the tank is compacting the soil.
29
Gravel is moving from inside to outside of corner.
all
55
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