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Sustainable foundations

Sustainable foundations. Alternative title slide. Istructe south Stephen west. What is sustainability. Oxford English Definition: able to be maintained at a certain rate “conserving an ecological balance by avoiding depletion of natural resources”. Content slide.

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Sustainable foundations

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  1. Sustainable foundations Alternative title slide Istructe south Stephen west

  2. What is sustainability Oxford English Definition: able to be maintained at a certain rate “conserving an ecological balance by avoiding depletion of natural resources” Content slide

  3. WHAT IS Sustainability It’s about balance Liveable Viability Sustainable Development Fair

  4. What is sustainability • Finding a balance • Carbon accounting can be useful • Consider the long term as well immediate • Good design should lead to sustainability • Foundation and sub-structure design can be used as offsets Content slide

  5. Is this sustainable???

  6. Not if it leads to this

  7. Should we worry about sustainability • Improve long term cost benefits • Enhance Bid Potential • EA Compliance • Future Government Policy Content slide

  8. Factors to be considered • Materials • Manpower input • Quantity of Foundation Positions • Muckaway quantities Content slide

  9. Embodied vs Operational Embodied Carbon Operational Carbon Whole Life Carbon Content slide, two columns with image

  10. Factors to be considered • Materials • Manpower input • Quantity of Foundation Positions • Muckaway quantities • Site Impact – Contamination Future Site re-use Content slide

  11. Should the foundations fit the superstructure or vice versa • Spaced load takedown for localised loading points • Widened load application for spread foundations • Can a basement help? • Load vs Settlement Content slide, two columns with image

  12. Contamination risks • Worker Health and Safety • Long term user impact • Groundwater Quality Protect against downward flow of contaminants Contaminated Soil/Groundwater Content slide Impermeable Layer Protected Aquifer

  13. Dealing with marginal ground • Is this an opportunity? • Improve or Bypass? • Ground Types Content slide

  14. Dealing with marginal ground • Is this an opportunity? • Improve or Bypass? • Ground Types organic soils, peat soft cohesive soils loose granular soils waterlogged soils Content slide

  15. Dealing with marginal ground • Is this an opportunity? • Improve or Bypass? • Ground Types • Site wide or localised? Content slide

  16. Foundation options Remove & Replace Piles Deep Footings Surcharging IMPROVE BYPASS Content slide Soil Mixing Vibro-concrete columns Stone Columns

  17. Sustainable piling • Auger based displacement piles – CFD/CHD Compresses + Expands column Content slide

  18. Sustainable piling • Auger based – CFD/CHD • Screw Piles Content slide

  19. Sustainable piling • Auger based – CFD/CHD • Screw Piles • Driven options – closed end piles Content slide

  20. Sustainable piling • Auger based – CFD/CHD • Screw Piles • Driven options – closed end piles • Mitigating Contamination Impact Minimal disturbance Piling – CFA, CHD Oversize protective shaft Contaminated Soil/Groundwater Content slide Impermeable Layer Protected Aquifer

  21. Sustainable piling • Auger based – CFD/CHD • Screw Piles • Driven options – closed end piles • Mitigating Contamination Impact • Energy Piles Content slide

  22. Ground improvement • Lime/cement mixing Content slide

  23. Ground improvement • Lime/cement mixing • Dynamic compaction Content slide

  24. Ground improvement • Surcharging Surface Loading Increased Porewater Pressures Content slide

  25. Ground improvement • Surcharging Granular layer to promote flow rates Surface Loading Increased Porewater Pressures Content slide Vertical drainage to promote more rapid consolidation

  26. Ground improvement • Wick Drains or Band Drains Content slide

  27. Ground improvement • Wick Drains or Band Drains Content slide

  28. Ground improvement • Wick Drains or Band Drains • Stone Columns Content slide

  29. Ground improvement • Wick Drains or Band Drains • Stone Columns Content slide Compacts soil as well as providing a drainage path

  30. Foundation re-use • Growing opportunities • Needs buy in throughout project team • Requires record retention • Testing of existing piles • Foundation Removal Content slide

  31. The future • Chance to be more brave!!! • More rafts?? • Less unnecessary excavation?? Content slide

  32. The future • Chance to be more brave!!! • More rafts?? • Less unnecessary excavation?? – Better Investigation Content slide

  33. The future • Chance to be more brave!!! • More rafts?? • Less unnecessary excavation?? – Better Investigation • Better foundation records • Pre-fabrication of foundation Content slide

  34. The future • Chance to be more brave!!! • More rafts?? • Less unnecessary excavation?? – Better Investigation • Better foundation records • Pre-fabrication of foundation Content slide Is this sustainable?? – discuss

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