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thickened edge slab VS. raft foundation

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ohyeh

ohyeh

Geotechnical
Joined
Sep 26, 2007
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what are the differences for both structural design and geotechnical recommendations? Will they perform equally if differential settlement is a concern?
 
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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.
 
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What about it? Any mat should be deep enough that it doesn't matter and the turn downs should be below the frost level.
 
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helps against erosion of soil at underside of slab being a problem.
 
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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.
 
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