Terzaghi’s Bearing Capacity Factor - Ng 1

[mar2805]

Hi folks!
When using standard formula for Kp (lateral passive earth pressure) in Terzaghi formula, I cannot get an correct value for N gamma.
Egsample for 30deg, N gamma should be 19,13.
Using equation attached I get an value of 0.866
Whats wrong?

 

[mar2805]

https://files.engineering.com/getfi...-407b-4eae-b7d0-631b23f6afe7&file=N_gamma.jpg

 

[GeoEnvGuy]

I do not know where you obtained your formula for Ngamma, but the image is from terzaghi's book.

 

[mar2805]

Thanx!

 

[SomeQuestion]

Hello, /i have a similar question for piles,is there a formula for Nq relating to friction angle in wet soil (sand) or we should refer to the graph only.. I need a formula of Nq function of friction angle for derivation and other purposes than usual bearing capacity calculation so that's why..