PERFORMANCE EVALUATION
The performance of vehicles and test sections will be evaluated after 1, 10, 25
and 50 passes of each vehicle. Each test section is evaluated separately; therefore,
we will need 10 National Guard evaluators at the wooded trail, 8 at the slopes and
5 at the corners. Karen Henry or another CRREL representative will be present for
support during the evaluation.
Aside from the self-explanatory notations on the evaluation form, the rut
depths and test section expansion must also be measured after 1, 10, 25, and 50
passes.
Rut depth
Intermediate rut depths can be measured by laying a straight rod or level
across the rut and measuring the distance from the rod to the bottom of the rut.
Final rut depths will be more thoroughly characterized by measuring the road
profile using the profilometer (Fig. F5). CRREL will provide two profilometers
which must be shared by the evaluators (one person can call the depth while the
other records data).
Quick Rut-Depth Measurements
Figure F5. Rut-depth
measurements.
Profilometer
Lateral expansion
Each of the test sections will be staked on the sides prior to testing. The distance
across the test section, measured at these stakes will be recorded at 1,10, 25 and 50
passes of each vehicle (Fig. F6).
After ALL trafficking tests have been completed, every test section that utilized
a geotextile separator should be carefully excavated so that a 2 m by 1 m (approxi-
mate size) sample can be cut from the material. This should also be done for any
geosynthetic material that was anchored by placing fill (chunkwood, logs, slash,
gravel, etc.) into ruts. The purpose of the excavation is to be able to visually
inspect the material for damage. A representative from CRREL will be present to
indicate where the excavation should occur, observe excavation and take the
sample. It is important that the material not be damaged by the backhoe during
excavation. One backhoe or other excavation equipment and operator, and two
laborers will be required for this task.
In addition to the evaluation measurements and observations, the construction
and performance with be recorded on video by CRREL and others.
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