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›The Future of Building
Foundations in the
Canadian North
› Prepared by: Christine Harries. P.Eng
Current Practice
Steel Tripod Footing on wood base on compacted gravel
The problem…
3
›Permafrost is retreating
downwards which leads to…
›Building movement
Solution 1: Concrete Footing on Bedrock
4
1. Often anchored to rock
1,5meter with 25M rebar.
2. Choice depends on depth of
roc: normally maximum 3
meter excavation
3. Shows importance of good
geotechnical report
All solutions are elevated from
ground surface
Solution 2 : Concrete Footing on Permafrost
5
1. Excavate down to sound
permafrost
2. Place insulation 100mm
between permafrost and
concrete
3. Additional insulation above
footing 50mm
4. Attention during excavation
to minimize heat to deep
permafrost
5. Shows importance of good
geotechnical report
Solution 3 : Steel Pile anchored to Bedrock
6
1. Anchor steel tube into rock
by boring.
2. Fill tube with concrete,
leaving holes.
3. Depth depends on loads and
rock quality. +/-3meters
Solution 4: Steel Pile anchored into Permafrost
7
1. Depth depends on anticipated
permafrost retreat
2. Bore hole larger than pile. Fill gap
with water/sand slurry.
3. Shows importance of exploratory
boreholes to understand depth of
permafrost
Solution 6: Steel/Aluminum lattice truss network
8
1. Many posts allows good weight distribution
2. Differential settlement reduced
3. Gravel compaction still important
To summarize
9
› Piles are the most sure option,
however are costly.
› Concrete footings on bedrock are the
best option for quality/cost, if the
bedrock is shallow.
› Geotechnical report of utmost
importance
› Elevate structure
› Do not allow permafrost to melt during
excavation
Thank you,
10
›With great thanks to Professor Ge, from Concordia University and the team at
SNC-Lavalin for their guidance and support.
›Questions ?With

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The Future of Building Foundations in the Canadian North

  • 1. ›The Future of Building Foundations in the Canadian North › Prepared by: Christine Harries. P.Eng
  • 2. Current Practice Steel Tripod Footing on wood base on compacted gravel
  • 3. The problem… 3 ›Permafrost is retreating downwards which leads to… ›Building movement
  • 4. Solution 1: Concrete Footing on Bedrock 4 1. Often anchored to rock 1,5meter with 25M rebar. 2. Choice depends on depth of roc: normally maximum 3 meter excavation 3. Shows importance of good geotechnical report All solutions are elevated from ground surface
  • 5. Solution 2 : Concrete Footing on Permafrost 5 1. Excavate down to sound permafrost 2. Place insulation 100mm between permafrost and concrete 3. Additional insulation above footing 50mm 4. Attention during excavation to minimize heat to deep permafrost 5. Shows importance of good geotechnical report
  • 6. Solution 3 : Steel Pile anchored to Bedrock 6 1. Anchor steel tube into rock by boring. 2. Fill tube with concrete, leaving holes. 3. Depth depends on loads and rock quality. +/-3meters
  • 7. Solution 4: Steel Pile anchored into Permafrost 7 1. Depth depends on anticipated permafrost retreat 2. Bore hole larger than pile. Fill gap with water/sand slurry. 3. Shows importance of exploratory boreholes to understand depth of permafrost
  • 8. Solution 6: Steel/Aluminum lattice truss network 8 1. Many posts allows good weight distribution 2. Differential settlement reduced 3. Gravel compaction still important
  • 9. To summarize 9 › Piles are the most sure option, however are costly. › Concrete footings on bedrock are the best option for quality/cost, if the bedrock is shallow. › Geotechnical report of utmost importance › Elevate structure › Do not allow permafrost to melt during excavation
  • 10. Thank you, 10 ›With great thanks to Professor Ge, from Concordia University and the team at SNC-Lavalin for their guidance and support. ›Questions ?With