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Sustainable foundations

This presentation delves into the concept of sustainability in construction, particularly focusing on foundation design. It provides an understanding of sustainability and its importance in achieving balance in resource use. Key topics include carbon accounting, material selection, and the impact of foundation options on long-term environmental sustainability. The discussion covers various aspects such as contaminated ground, foundation strategies, and ground improvement techniques that can mitigate risks. Ultimately, it aims to foster innovative practices that enhance project viability while ensuring ecological preservation.

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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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