ocgeo
Geotechnical
- May 28, 2014
- 31
We have a clean sand site with average blow counts in the upper 2B (B = 12 ft. square = width of footing) of 30.
I calculate a bearing capacity of about 10,200 psf for a settlement of 1 inch per the analysis in Bowles Foundation Design (base don Terzhagi and Peck 1967).
We have column loads of about 1,500 kips so we need to recommend a bearing pressure for reasonable size of footing.
Traditional Terzhagi Bearing Equation with FS = 4 results in 15,000 psf.
Does 10,000 psf seem reasonable for a sand, some silty sand, with N average of 31 to a depth of 2B?
I calculate a bearing capacity of about 10,200 psf for a settlement of 1 inch per the analysis in Bowles Foundation Design (base don Terzhagi and Peck 1967).
We have column loads of about 1,500 kips so we need to recommend a bearing pressure for reasonable size of footing.
Traditional Terzhagi Bearing Equation with FS = 4 results in 15,000 psf.
Does 10,000 psf seem reasonable for a sand, some silty sand, with N average of 31 to a depth of 2B?