Selecting subgrade modulus value for slab design
Selecting subgrade modulus value for slab design
(OP)
I have a site with variable soil types. Layers of sand, silts and clays. When designing a slab on grade, how many feet below the bottom of the proposed slab should I be analyzing? There will be loaded front end loaders driving on the slab. I alway use the soil type with the lowest "k" value to be conservative but was wondering up to how many feet below should I go. For instance, if I have 2' of sand overlaying clay should I use the value for clay? Can I do a composite value? Up to what depth? Thanks.





RE: Selecting subgrade modulus value for slab design
The loading is temporary. You might consider excavating the lower 2' or so beneath the slab. The area should be proof rolled with a sufficiently loaded earth mover or something of that ilk. Soft spots excavated and filled using a proper compacted engineered fill. The 2' beneath the slab should be filled and compacted with suitable material.
You might consider using a geotextile layer and if the area is subject to frost heave (silts are a big problem). Talk to a geotekkie in the area...
Dik
RE: Selecting subgrade modulus value for slab design
RE: Selecting subgrade modulus value for slab design