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Use of Launched Soil Nails to Stabilize Shallow Slope Failure on Urban Access Road 172


In the transportation industry there are many methods of slope and embankment stabilization. Traditional soil nailing is one such method, which employs inserting nails into pre-drilled holes, then grouting them into place. A variant of this procedure, Launched Soil Nails (LSN), uses compressed air to accelerate a 6 m long 40 mm diameter steel nail or rod into the ground at over 350 km/hr. Research has indicated that at this high velocity a shock wave is generated ahead of the nails that elastically deforms the soil which subsequently rebounds and bonds to the nails (i). LSN was used on an Alberta Transportation (AT) project site near the village of New Sarepta about 40 km southeast of Edmonton on Urban Approach Road 172. The failed area was a shallow slope failure approximately 130 m2 in size. The LSN solution was ideal for site specific considerations such as a nearby high pressure oil pipeline, fibre optic cables crossing the failed area, 1200 mm diameter culvert immediately beneath the failed area, high road fill, and limited access. LSN is not a broad replacement for traditional methods of slope stabilization. However, in cases where slope failures can be compared, LSN has its advantages over traditional methods of slope stabilization. LSN reduces cost, saves time, reduces public disruptions, reduces environmental concerns, and is a flexible and viable option for stabilizing slopes.

Conference Paper Details

Session title:
Jermaine Smith
Chris Gräpel
Sam Proskin
Sabhago Oad