Geotechnical and environmental considerations when redeveloping deep-filled and former landfill sites
- 1. Copyright of RSK Geotechnical and environmental considerations when redeveloping deep-filled and former landfill sites 14 November 2014 1 Peter Witherington Managing Director
- 2. Copyright of RSK Introduction Significant constraints: Social Economic Environmental Engineering 14 November 2014 2
- 3. Copyright of RSK 14 November 2014 3 BRE 424 Charles and Watts
- 4. Copyright of RSK The problem of deep fill Received little research attention “…the heterogeneous nature of many waste fills makes characterisation and analysis difficult, and it is easy to understand why the attention of geotechnical engineers has usually focussed on more promising and better behaved natural soils…” BRE reaction: Monitoring of field performance Characterising fills on the basis of observed performance Assessing the effectiveness of various ground-treatment techniques Dr J. A. Charles, 2008 Rankine Lecture, ‘The engineering behaviour of fill materials: the use, misuse and disuse of case histories’ 14 November 2014 4
- 5. Copyright of RSK Settlement mechanisms Applied loading is rarely the problem… However, we must address Self weight Change of groundwater level Collapse settlement Decomposition of biodegradable material Chemical decomposition 14 November 2014 5
- 6. Copyright of RSK How to investigate properties Conventional investigation is of little use. Difficulty of Drilling Sampling In situ testing Laboratory testing Need for Long-term monitoring of surface settlement groundwater level Large and medium-size loading tests 14 November 2014 6
- 7. Copyright of RSK Treatment methods “With non-engineered fills the unexpected is only too likely to occur. Ground treatment before construction can mitigate or forestall the effects of the unexpected.” Consider Engineered backfilling Dynamic compaction Vibro compaction Pre-loading (surcharging) Pre-inundation 14 November 2014 7
- 8. Copyright of RSK Opportunity? 14 November 2014 8
- 9. Copyright of RSK Opportunity! 14 November 2014 9
- 10. Copyright of RSK Opportunity? 14 November 2014 10
- 11. Copyright of RSK Three centuries of mining 14 November 2014 11
- 12. Copyright of RSK Opportunity! 14 November 2014 12
- 13. Copyright of RSK Investigations: instrumentation 14 November 2014 13
- 14. Copyright of RSK Load tests 14 November 2014 14
- 15. Copyright of RSK Load tests 14 November 2014 15
- 16. Copyright of RSK Load tests 14 November 2014 16
- 17. Copyright of RSK And? 14 November 2014 17
- 18. Copyright of RSK 14 November 2014 18