Hi everybody,

I’m studying the undrained analysis with undrained parameters as the picture below (I got it from your manual of Plaxis ver 8.5).

The input parameter of the friction angle affected to static lateral earth pressure coefficient K_o = 1. This leads to sigma’_y = sigma’_x, my question is whether modification K_o= 1 – sinf’ instead K_o = 1 in the generation of initial stress of soil need or not? Pls follow my illustration as below

Besides, I’d also like to ask you about this modification of K_o =1 – sinf’ instead K_o = 1 in the method of undrained B, C of Plaxis 2D ver 2017 need or not?

Thanks in advanced!