Hi, I have a site where we have a variable thickness of fill (Class 2C), generally placed to >95% MDD (2.5kg proctor) and generally <5%. Due to some unforeseen circumstances we have had to excavate much deeper in areas to the natural formation (which is a stiff clay). For reference the fill was removed from a backfilled quarry and re-used insitu, compacted in 250mm layers with a vibratory roller (approximately 13T). The fill varies from approximately 4m thick to 16m deep. Whilst most of the self-settlement of the fill would have occurred during compaction and construction (built over approximately 6 months), I need some calculations to back up time to 95% consolidation settlement and calculations for total anticipated self settlement of the different thicknesses of fill (i.e. 4m vs 16m). To put this is context, depending on the final development plan houses may be built over different thickness of fill, so we need to ensure that differential settlement is not going to be an issue (for reinforced strip foundations) and the time it may take, so a construction plan can be developed. Any help/ideas very welcome.
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