“jacked slab construction?…several jacked slab buildings have collapsed in various places”.
Slab jacking is not a construction. It is a repair to a foundation that already has problems.
There is a construction technique where all floor slabs are formed and poured at ground level and then jacked up along columns to their final floor…Then they are anchored to the columns…don’t know if that was the case here…I suspect substandard concrete and/or foundation issues…