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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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field investigations
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
groundwater conditions

Clay : 2 m below ground, Elv. 231 m

  • Bedrock/Till : Elv. 224 to 226 m
  • Impact on:
  • Excavation stability
  • Global stability
  • Seepage
Groundwater Conditions
geotechnical concerns
Geotechnical Concerns
  • Foundation type
  • Rebound, heave and settlement
  • Retaining walls
  • Base heave
  • Temporary shoring and excavation plan
bearing capacity and foundation type
Bearing capacity and foundation type
  • Raft foundation
  • Design based on the concept of floating foundation
  • Bearing capacity and settlement pressure are defined
retaining walls
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
base heave
Base heave

Clay

h

Wclay

Till/Bedrock

FS = Wclay /

γw h

slide13

TYPICAL

EXTREME HISTORICAL

temporary shoring and excavation plan
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
temporary shoring and excavation plan1
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

temporary shoring and excavation plan2
Temporary shoring and Excavation plan
  • Excavation configurations
      • Braced Shoring up to 9.5 m

4.6 Min

~ 9.5

~ 5

temporary shoring and excavation plan3
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

temporary shoring and excavation plan4
Temporary shoring and Excavation plan
  • Base Instability : analogous to bearing capacity
global stability
Global Stability
  • - Stress – stability coupled finite element analysis
  • Locally acceptable soil parameters
  • Account for excavation unloading
  • Model train loading
  • Design objective FS = 1.30
performance monitoring program
Performance Monitoring Program
  • Instrumentation will be installed to monitor
  • Displacement of railway tracks
  • Displacement of shoring system
  • Horizontal subsoil displacement
  • Excavation heave
  • Groundwater levels
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