Pole/mast foundation design

Hi All,

Does anyone know about UIC ORE design for pole/mast foundation ? This is OCS pole for railway. I have searched the net but in vain. I have in my possesion the templates indicating the depth and diameter for the corresponding moment , but I dont comprehend the basis of the design . There is a K value given for various soil unit weight. How does this K derived?

What I know is the Broms method which is either using numerical or graphical i.e taking into account the passive earth pressure to counter the overturning moment. The mast is likened to be a pile either short or long which is determined by stiffness factor.

Regards