Drilled Shaft Foundations For Two Mississippi River Bridges in Louisiana
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1 Drilled Shaft Foundations For Two Mississippi River Bridges in Louisiana Dan Brown, P.E., Ph.D. Dan Brown and Associates Overview Two River Bridges with Drilled Shafts: John James Audubon Bridge, St. Francisville Huey P. Long Bridge, New Orleans Common Features: Fully cased shaft excavations, 200ft deep Base grouted
2 Cased-Ahead Construction starter casing slurry concrete tremie concrete (a) (b) (c) (d) (e) Base Grouting Enhance Axial Resistance Improve Reliability Mitigate Imperfections in Base Conditions Criteria: Target Pressure Minimum Net Volume Limit Upward Shaft Movement
3 Base Grouting Tube á Manchette (using CSL tubes) Cover Plate Audubon Bridge Cable-stayed bridge, 1583 main span Two pylons: 3 x 7 group of 7.5 dia. Shafts High approach: 2 column piers
4 Soil Conditions at Pylons SPT "N" (blows/ft) Silty Sands 0-50 Elevation (ft) Sand Sand with Layers of Sandy G Shaft Tip Elevation Clay Soils Undrained Shear Strength (tsf) Casing & Oscillator System
5 Excavation
6 Dan Brown & Associates
7 Base Grouting Measurements Pressure (Auto) Pressure (Manual) Volume Grout Pressure (psi) Net Net Net Grout Volume (cu. ft.) Net Time (minutes) 0 Performance During Grouting
8 O-cell Load Testing w/ Reaction Frame Load Test Results 0.00 O-Cell Load (tons) ,000 1,500 2,000 2,500 3,000 3,500 Base Grouted Downward Displacement (inches) NOT Base Grouted 136ksf (950psi) 5.00 Shaft 11W Load Test Shaft T2 Load Test Shaft T4 Load Test Shaft 11E Load Test Shaft 15E Load Test Shaft T3 Load Test
9 Two Odd Shafts Displacement (inches) O-cell load (MN) Not Grouted 1W Construction Difficulty 4W CISS 0 1,000 2,000 3,000 O-cell load (tons) Displacement (mm) Huey P. Long Bridge Widening Owner: La. DOTD Structural Engineers: Modjeski and Masters Geotechnical Engineers: Eustis Engineering General Contractor: Kiewit/Massman/Traylor Subcontractor: Malcolm Drilling Company Foundation Consultant: Dan Brown and Associates
10 Pier IVA Test Shaft Production Shafts
11 Rotator System Casing
12 Excavation Using Hammer-grab 23 Shaft Cleaning & Inspection Airlift SID Bottle Brush (Hydraulic) Cleaning Bucket Place Gravel 24
13 Reinforcement Bar Splices Backbone Frame Placement of Reinforcement
14 Shaft/Cap Connection Isolation Casing Shaft Cutoff at -11 Concrete Recover (7 oz/cwt) VMA (3 oz/cwt) 28
15 Base Grouting Base Grouting QC/QA 30
16 Performance of Load Test Displacement, inches Displacement, inches ksf Load, kips Load, kips Completed Foundation
17 Summary Foundations for large bridges present special challenges: key issues Construction plan to minimize risks Constructability issues of design Coordinated effort of partners Performance verification requirements Don t get bit!
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