calculating skin friction at piles by beta method

[atuter]

In question number 69 of six minute for geotechnical, for PE exam study, it tells us to calculate the skin friction based on Beta Method, and uses cohesion of the soil. no angle of friction between pile and soil is given, the question doesnt talk about it. so it uses the beta method and calculates the skin friction.

we didnt add the capacity from skin friction because it was not given correct?

and in reality there is always a skin friction?

and all the layers of soil in question have Teta, angle of internal friction given. does having skin friction angle between pile and soil have anything to do with having Teta, angle of internal friction?

 

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