Deep Helix Anchors
Deep Helix Anchors
(OP)
I am working on a project in an old alluvial flood plain with liquefiable sands 40-50' deep on top of sandstone. The soils engineer has recommended helix anchors, embedded 5 feet into dense sandstone. I don't have much experience with helix anchors this deep, but have heard that the longer they get the less effective they are in resisting horizontal offsets. Is this a feasible deisgn alternative, and what are the critical design parameters? I appreciate any advice you can give. Thanks!





RE: Deep Helix Anchors
RE: Deep Helix Anchors
Are you looking to design anchors (I assume for temporary earth support) or are these really piles to support the new structure? What kind of loads are you dealing with?
Also, I'm not really sure what you mean by "resisting horizontal offsets." Do you mean an anchor's ability to carry load?
RE: Deep Helix Anchors
RE: Deep Helix Anchors
Check what the stiffness of the sands is with regards to lateral restraint as you might find that your effective length of the piles is the full 40-50'.