Dear All,
I have conveyor foundation with 75 KPa structure bearing pressure (deliberate designed with less structure bearing pressure), it will stand on the embankment mining soil which is backfill and compaction not follow common procedure (backfill and compaction should be 25cm per layer, but mining adopt 1m per layer and no compaction, just dumping with Hauling Dumptruck).
The only data i have is SPT..If i look at bearing capacity, it is obviously backfill soil can support those structure. But if i look at backfill & compaction in mining, it is horrible about settlement issue..

Can i used SPT data to analyse settlement? most of soil composition is cohessive with firm upto stiff consistency.It is understood when we try to analyse settlement, condition of soil wheather normal consolidated or overconsolidated is important thing.

What the conservative way to analyse settlement between assuming normal consolidated or underconsolidated or overconsolidated?

Last question is, do i need soil replacement to reduce the value of settlement? i have silty sand as soil replacement to be use for other structure.

oh, i almost forget.. Client guarantee for upper layer soil with 200Kpa ultimate bearing capacity