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Evaluating Wick Drain Performance in Virginia Soils

Evaluating Wick Drain Performance in Virginia Soils. Susan E. Burns University of Virginia. Graduate and Undergraduate Research Assistants. Matthew J. Cline M.S. Civil Engineering, 2002. J. Matthew Wright B.S. Civil Engineering, 2001. Prefabricated Vertical Drain Study.

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Evaluating Wick Drain Performance in Virginia Soils

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  1. Evaluating Wick Drain Performance in Virginia Soils Susan E. Burns University of Virginia

  2. Graduate and Undergraduate Research Assistants • Matthew J. ClineM.S. Civil Engineering, 2002 • J. Matthew Wright • B.S. Civil Engineering, 2001

  3. Prefabricated Vertical Drain Study • Literature Review / Soil Characterization • Damage Testing (complete June 01) • 90° Crimp • Lateral Pressure Test (start May 01) • Consolidation (start June 01)

  4. Prefabricated Vertical Drain Cores

  5. PVD Properties *All fabric and cores made from polypropylene**Amerdrain – ASTM D 4632; Mebra-Drain – ASTM D 638*** ASTM D4716

  6. Wick Drains Used in Crimp Testing

  7. Vertical Discharge Capacity - Hydraulic • Vertical water flow • Constant head 1 kPa (1.45 psi) • Measure flowrate through wick • Crimp with a 90° bend, measure flowrate • Measure flowrate through empty heat shrink Flow Flow

  8. Vertical Discharge – PVD Methodology • PVDs encased in heat shrink tubing • Uniformity critical • Insert wick into heat shrink • Clamp into aluminum plates, with spacers • Heat aluminum to shrink tubing

  9. PVD Discharge Capacities (mL/s)

  10. 90° Crimp Test Results

  11. Horizontal Discharge Capacity • Conforms to ASTM D4716 • Measure lateral discharge through wick • Compact soils; apply range of stresses • Measure discharge under increasing lateral stress

  12. Lateral Stress Test

  13. Soil Types • Four soils to be tested: • Woodrow Wilson Bridge • Interbedded sand and clay • West Point • Soft clay with organics • Craney Island • Marine clay • Sandy silt • High shear strength, high permeability

  14. Woodrow Wilson Bridge Soil Characterization

  15. Craney Island Soil Characterization

  16. Conclusions • Fin & corrugated high strength fabric performed best in crimp test • Corrugated & dimple core perform similarly • Corrugated low strength fabric had highest flow reduction • Using same core, fabric strength influenced flow reduction, with strongest fabric showing the least reduction

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