Wet, very loose sand
Wet, very loose sand
(OP)
I have a home site with rock on one side. On the other side is up to 23 feet of very loose, low plasticity, clayey sand, with water levels at about 4 feet. Just looking for other ideas for support, except for driven piles or conventional concrete piers. There is a little resistance in the upper foot, but N values are 2 at 2 feet depth. Below the water table, the SPT hammer sinks in a few inches prior to the test. There is zero lateral support available here, correct? Maybe a little lateral support for a grade beam?





RE: Wet, very loose sand
RE: Wet, very loose sand
RE: Wet, very loose sand
- micropiles;
- bored concrete piles;
- jet grouting;
- soil replacement.
Or create a deep indoor swimming pool... :)
RE: Wet, very loose sand
RE: Wet, very loose sand
@avscorreia: Yea, need to add some kind of cool water feature to this place. Would slender piles be an option, given what i'm assuming is 0 lateral support? Does grout injection work under water?
RE: Wet, very loose sand
As for jet grouting, it's not a standard low-pressure grout injection. It works at high pressures (typically 20 to 40 MPa), so under water works aren't really a problem. Some additional info:
http://www.skanska.co.uk/global/sevices/piling/dat...
http://www.spezialtiefbau.bilfinger.com/fileadmin/...
http://www.bauerpileco.com/export/sites/www.bauerp...
Nevertheless, you should check its applicability to your problem and its economic feasibility with a local contractor.
For the problem you have in hands, in my part of the world it would probably be more efficient to use micro-piles or, if the slenderness requirements were too high, regular cast-in-place RC piles (Continous Flight Auger piles may be an option but again, check with a local contractor).
RE: Wet, very loose sand
RE: Wet, very loose sand
RE: Wet, very loose sand
RE: Wet, very loose sand
RE: Wet, very loose sand
RE: Wet, very loose sand
RE: Wet, very loose sand
RE: Wet, very loose sand
I've had sites before with deep loose soils where we've run a large sheeps foot compactor on the surface for several days. Additional borings showed compaction kept getting deeper and deeper until the site was ready for development. We lowered the water table with pumping prior to compaction.
RE: Wet, very loose sand
RE: Wet, very loose sand
RE: Wet, very loose sand