PEinc,
Thanks yes the new basement wall is designed as a foundation wall and supported by a concrete first floor and basement slab.
If I were to use helicals, do they usually get set just after the pit excavation (through the approach pit)? And then the underpin concrete poured around them?
Fatdad,
Thank you,
You are correct the 50 psf was for the active pressure which I was hoping would work w/o anchors. The at rest is 73 psf (EFP) and is what I used to get the 20kips lateral for each tie back/raker.
I am designing traditional pit underpinning for a new addition with basement in an existing building. The building is a lightly loaded one story structure with a 2 ft wide concrete wall footing about 3 ft below existing grade. The new basement's bottom of footing will be 10 ft below the...
