Preparation of trenches
OmniTrax Product Guide Page 107
Burial in clay
Installing sensor cables in moderate or heavy clay requires modified installation techniques. When
using modified techniques, install and test one sensor cable set at a time.
Burial in moderate clay soil (OC2/SC2 cables only)
This technique includes moderate clay soil with, or without, a vegetation topping.
• reduced burial depth of 15 cm (6 in.)
• dual trench installation requires two trenches 15 cm deep and 10 cm wide
• single trench installation requires one trench 15 cm deep and 15 cm wide
• do not use a sand buffer or geotextile fabric
• clay chunks must be broken up before backfilling to prevent damaging the cables
• a dual cable system must be used (OC2, SC2)
• maximum cable spacing is 1 m (3.3 ft.)
Burial in heavy clay soil
Figure 71: Trench dimensions under a large asphalt surface (completed narrow spacing/micro-trench)
Figure 72: Installation in moderate clay soil
Note If your site includes heavy clay soil, Senstar recommends engaging a
Geotechnical Engineering firm to assess the soil and drainage
conditions.
Note Install and test one cable set, before proceeding with the full installation.
The test must include the saturation of the soil to the moisture content
extremes that typically occur in the area.
trench depth
30 cm (1 ft.)
stone dust
restored asphalt
cable depth
23 cm (9 in.)
sensor cable
stone dust
restored asphalt
asphalt
(single cable micro-trench for dual trench installation)
micro-trench
asphalt
(narrow cable spacing example - single or dual trench installation)
sensor cables
marker tape
clay backfill
sensor cable
7.5 cm (3 in.)
15 cm (6 in.)
moderate
clay soil
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