1. City of Winnipeg SOUTHWESTERN RAPID TRANSIT CORRIDOR Bidder Meeting October 16 th, 2009

2. Site Location

3. Field Investigations - Klohn Krippen (2003) - Geotechnical 4 deep test holes, 1 shallow Groundwater monitoring Laboratory testing –AECOM (2009) - Geotechnical 2 deep test holes ( rock coring) Groundwater monitoring Laboratory testing –AECOM (2009) – Hydrogeological Two test wells drilling Field pump tests

4. Location of Test Holes TW 2 TW 1

5. Soil Stratigraphy

6. Field and Lab Results

7. Groundwater Conditions –Clay : 2 m below ground, Elv. 231 m –Bedrock/Till : Elv. 224 to 226 m –Impact on: Excavation stability Global stability Seepage

8. Geotechnical Concerns – Foundation type – Rebound, heave and settlement – Retaining walls – Base heave – Temporary shoring and excavation plan

9. Bearing capacity and foundation type – Raft foundation – Design based on the concept of floating foundation – Bearing capacity and settlement pressure are defined

10. Rebound, Heave and Settlement

11. Retaining walls - Reinforced Concrete U-shaped section - Reinforced Concrete Cantilever wall - Coulomb Theory - Design for surcharge from compaction during construction - Design for live load surcharge from Cooper E90 loading -

12. Clay Till/Bedrock FS = W clay / γ w h Base heave h W clay

13. TYPICAL EXTREME HISTORICAL

14. Temporary shoring and Excavation plan – Cut and cover construction – Staged construction, Stage I and II – Site constrains: Limited space Utilities Private property Proximity to CN tracks – Excavations plan include: Open excavation Cantilever / Braced Shoring Combination of shoring and open excavation

15. Temporary shoring and Excavation plan – Excavation configurations Open Excavation, up to 6 m cut Other geometry < 6m cut 3 1 14 3 3 3

16. Temporary shoring and Excavation plan – Excavation configurations Braced Shoring up to 9.5 m ~ 9.5 4.6 Min ~ 5

17. Temporary shoring and Excavation plan – Excavation configurations Combination of Braced Shoring and Open excavation 4.6 3 - 5 2-3 1 3 7m bench 5 m Crane pad varies 5 m Min. varies 7 Max.

18. Temporary shoring and Excavation plan Lateral Loads from Surcharge

19. Temporary shoring and Excavation plan Base Instability : analogous to bearing capacity

21. Global Stability - Stress – stability coupled finite element analysis - Locally acceptable soil parameters - Account for excavation unloading - Model train loading - Design objective FS = 1.30

22. Stability output

25. Stress-Deformation Analysis

27. Performance Monitoring Program Instrumentation will be installed to monitor – Displacement of railway tracks – Displacement of shoring system – Horizontal subsoil displacement – Excavation heave – Groundwater levels

28. THANK YOU