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Woodrow Wilson Bridge Reconstruction Test Embankments for Route 1 Interchange

Woodrow Wilson Bridge Reconstruction Test Embankments for Route 1 Interchange. June 4, 2001. VDOT. WWB TEST EMBANKMENTS. Recommended by FHWA Limited Scope/Budget ($2 Million) Limited Time for Completion (1/00 to 2/01). VDOT. OBJECTIVES FOR TEST EMBANKMENTS. Assess Rates of Consolidation

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Woodrow Wilson Bridge Reconstruction Test Embankments for Route 1 Interchange

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  1. Woodrow Wilson Bridge ReconstructionTest Embankments for Route 1 Interchange June 4, 2001 VDOT

  2. WWB TEST EMBANKMENTS • Recommended by FHWA • Limited Scope/Budget ($2 Million) • Limited Time for Completion (1/00 to 2/01) VDOT

  3. OBJECTIVES FOR TEST EMBANKMENTS • Assess Rates of Consolidation • Verify Predicted Settlements • Optimize PV Drain Spacings • Determine Mix Design Parameters • Verify Design Assumptions • Verify Constructability • Refine/Develop Specifications VDOT

  4. P.V. DRAIN (PVD)TEST EMBANKMENT • 8’ of Granular Fill over 10’-12’ of Soft Alluvial/ Organic Clays (A1) over Terrace Sand/Gravel • 90’ x 45’ Embankment With Vertical MSE Face • Embankment 14’ +/- Above Original Ground • 6’ of Surcharge; 2’ Drainage (Sand) Blanket • 9,000 Tons of Select Material VDOT

  5. PVD INSTRUMENTATION • 12 Settlement Plates • 3 Observation Wells • 4 Vibrating Wire Piezometers • 3 Inclinometers • 2 Magnetic Extensometers • 16 Settlement Pins; 8 PK Nails VDOT

  6. PVD INSTRUMENTATION • Clustered for Constructability • Time for Installation included in Contract Specifications • Installation/Monitoring by VDOT (Owner) • Penalties (Time/Money) Assessed for Contractor Damage to Instruments VDOT

  7. DESIGN INFLUENCE OF PVD TEST EMBANKMENT • 5’ Spacing instead of 4’ Spacing • 6-Month Consolidation Stages • Estimated Direct Savings of $650,000 • Contractual “Lessons Learnt” (Pre-drilling; Pay quantities; Production Rates; Constructability) VDOT

  8. DEEP MIX METHODS (DMM)TEST EMBANKMENT • “Wet” and “Dry” Mix Columns (Single Augers) • “Wet” Mix Panels (Triple Augers) • 8’ of Granular Fill over 32’ of Very Soft Organic/Alluvial Clays (A1) over Terrace Sand/Gravel • Organic Contents 1%-15% VDOT

  9. DMM TEST EMBANKMENT

  10. DMM INSTRUMENTATION • 8 Settlement Plates • 1 Observation Well; 2 Piezometers • 4 Vibrating Wire Piezometers • 7 Inclinometers (6 Vert.; 1 Horiz.) • 2 Magnetic Extensometers • 8 Pressure Cells • 11 Settlement Pins • 6 Thermistors VDOT

  11. DESIGN INFLUENCE OF DMM TEST EMBANKMENT • Specified “Wet” Mix Exclusively • 2’ Construction Platform (Sand) • Contractual “Lessons Learnt” (Acceptance Criteria; Mix Design Criteria; Production Rates; Constructability) VDOT

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