I have a problem im trying to solve.
We are the structural engineer for a residential building (3 storey timber framed slab on ground) which has been built on a fill platform which is for flood protection and is average 1.5m deep.
It's still in construction and the builder noticed that the slab has settled 60mm. Up to 8m of marine clay (normally consolidated) wasn't identified as underlying the fill platform.
The settlement is occurring level across the slab (a stiff waffle slab) so that's good and the builder is willing to allow it to settle. Preliminary discussions suggest it could end up being 200mm.
Im interested to hear from anyone who is aware of any systems or processes that can speed up the consolidation process, conventional wick drains are difficult due to site constraints, additional pre-loading can be placed in some areas but not everywhere.
Has anyone used the vacuum consolidation method on a small scale project?
And one last question has anyone used injection grouting or any other similar method to stabilise/arrest the consolidation process in a soil mass. Bearing in mind we need to get under the slab which is 11m wide x 35m long.
Its a tricky problem but that's what we as Engineers are good at. I'm hoping someone out there might have an idea that we haven't thought of.