thickened edge slab VS. raft foundation

[ohyeh]

what are the differences for both structural design and geotechnical recommendations? Will they perform equally if differential settlement is a concern?

 

[GeoPaveTraffic]

The difference is rigidity. A properly designed raft is rigid and a slab with a turned down edge is not likly to be rigid.

Geotechnical parameters are going to be somewhat different. Performance will be significnatly different.

 

[MiketheEngineer]

What about frost heave??

 

[GeoPaveTraffic]

What about it? Any mat should be deep enough that it doesn't matter and the turn downs should be below the frost level.

 

[oneintheeye]

helps against erosion of soil at underside of slab being a problem.

 

[kslee1000]

Concerning differential settlement, mat foundation will be better choice than the stiffened edge foundation. However, for soil highly susceptible to differential settlement, neither would work better than pile foundation.