04 lafosse ppt final
DESCRIPTION
LaFosse PPT FinalTRANSCRIPT
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Design-Built Permanent Soil Nail Retaining Wall and Building Foundations at the University of
Connecticut Health Center
Ulrich La Fosse, P.E. GeoDesign, Inc.
Middlebury, CTNew York, NYWindsor, VT September 13, 2013
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Site Locus
SITE
Bridging Documents –Foundations and Wall Types
ACC Building – Drilled Shafts
Garage – Spread Footings
Site Wall Behind Garage• Temporary SOE• Buttress Type – Concrete Gravity Wall• Heights up to 55 feet & 450 feet long
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Bridging Docs Retaining Wall - Plan
Section 15-Ft24-Ft500-Ft
GRAVITY WALL
c
Bridging Docs Retaining Wall - Section
GRAVITY WALL
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Bridging Docs Temporary SOE & Wall
CONCRETEGRAVITY
WALL
TEMPORARYSOE WALL
Alternate Design Goals
Accelerate Construction
Eliminate work
Achieve economies
Meet Owner Criteria
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Alternate Design Concept
Combine Temporary & Permanent Support of Excavation
Replace Drilled Shafts with shallow Foundations (ACC)
Maximize Foundation Pressures (Garage & ACC)
Retaining WallDesign Considerations
Sparse Subsurface Data Very Tight Schedule for Design Tall Wall (up to 55 feet High) Wall Surcharge (1.5H:1V slope and
Road) Bridge Abutment Loading Combine Temporary & Permanent
Support of Excavation
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Surficial Geology
SITE
Retaining WallConstruction Considerations
Sparse Subsurface Data Tall Wall (up to 55 feet) Wall Surcharge (1.5H:1V slope and
Road) Bridge Abutment Loading Combine Temporary & Permanent
Support of Excavation
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EXISTING 2H:1V SLOPE
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Main Road and Traffic Surcharge
STEEP SLOPE ABOVE WALL
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Retaining WallPerformance Considerations
Must Limit Movement
Permanent Wall Considerations
Wall Finish – Varying Opinions
Alternate Design ConsiderationsACC Building
High Bearing Pressures Desirable Variable Soil Conditions
• Unsuitable Fill, over• Moderately dense Glacial Till, over• Dense to very Dense Till
Reworked Site – Possible unexpected variations and organics
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Permanent Soil Nail Wall Design
Partial Soil Wall Nail Plan
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Typical Soil Nail Wall - Section
Typical Soil Nail Wall - Section
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Typical Soil Nail Wall - Section
Typical Soil Nail Wall - Section
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Typical Soil Nail Wall - Section
Partial Soil Nail Wall – Elevation
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Soil Nail Wall – Detailed Section
CAPACITY OF TEMPORARYFACING IS NEGLECTED IN FINAL DESIGN
Start of Wall Construction
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DCP Soil Nailsand Temporary Shotcrete
Wall Facing
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IT IS IMPERATIVE TO BE ABLE TO CONTROL WATER and SOILS MUST BE ABLE TO STAND UNTIL SHOTCRETE HAS BEEN APPLIED
SLOUGHING SOILS
DRAINAGE, DRAINAGE, AND MORE DRAINAGE!
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A DCP SURPRISE!
A SIMPLE SOLUTION TO THE VEXINGPROBLEM OF LACK OF DCP AT TOP OF NAIL
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ANOTHER SURPRISEAN UNEXPECTED STUMP DUMP!
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Installation of Reinforcement for Final Shotcrete Wall Facing
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Application of Final Shotcrete Wall Facing
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Night Work to MeetProject Schedule
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Completed Wall
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Micropile-Supported Bridge AbutmentDirectly Behind
Permanent Soil Nail Wall
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Footing Preparationat ACC Building
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Thank You!
Questions?