Deep Foundation Cost Comparisons
Deep Foundation Cost Comparisons
(OP)
I have a site that will have 7-feet of dense gravel fill over 6-feet of soft sands (liquefiable) over native gravel at about 15-feet total. It may be hard to auger through the fill as it has cobbles. I'm considering micropiles, drilled shafts, geopiers, CFA piers, or whatever else would work best. I have had a hard time finding any comparative cost guidelines. For example, I suspect micropiles are more expensive than geopiers (in general) but just don't know. Does anybody have anything? Also, any thoughts on what concept would work best would be appreciated.





RE: Deep Foundation Cost Comparisons
You will need to register, but that is relatively painless.
This site is geared toward transportation foundations / structures and imperfect (as everything is), but a good one-stop shop.
Geopiers (rammed aggregate piers) in the traditional form (drill and fill) would not be appropriate for a caving sand, as the process would require casing. Unfortunately, Geopier (the company) has used the term too broadly to apply to both drilled and vibro techniques, which are vastly different in equipment and applicability.
If you allow for predrilling the upper "crust" of dense native, you open up more options for either deep foundations or ground improvement. However, cobbles are always challenging.
What are your foundation loads and what is the totla expected depth of foundation / GI?
RE: Deep Foundation Cost Comparisons
RE: Deep Foundation Cost Comparisons
RE: Deep Foundation Cost Comparisons