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City of Winnipeg SOUTHWESTERN RAPID TRANSIT CORRIDOR

City of Winnipeg SOUTHWESTERN RAPID TRANSIT CORRIDOR. Bidder Meeting October 16 th , 2009. Site Location. Field Investigations. - Klohn Krippen (2003) - Geotechnical 4 deep test holes, 1 shallow Groundwater monitoring Laboratory testing AECOM (2009) - Geotechnical

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City of Winnipeg SOUTHWESTERN RAPID TRANSIT CORRIDOR

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  1. City of WinnipegSOUTHWESTERN RAPID TRANSIT CORRIDOR Bidder Meeting October 16th, 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 1 TW 2

  5. Soil Stratigraphy

  6. Field and Lab Results

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

  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. Base heave Clay h Wclay Till/Bedrock FS = Wclay / γw h

  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 4 1 3 3 1 3 3

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

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

  18. Temporary shoring and Excavation planLateral Loads from Surcharge

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

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

  21. Stability output

  22. Stability output

  23. Stability output

  24. Stress-Deformation Analysis

  25. Stress-Deformation Analysis

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

  27. THANK YOU

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