In a given soil, the lateral effect of overburden pressure is constant with depth, as in $p=qk$, where:
- $p$: lateral pressure effect,
- $q$: overburden pressure
- $k$: soil lateral pressure coefficient.
Then, the effect of this overburden pressure on pile skin resistance will be constant or it would vary with depth? I read somewhere that it varies with depth. If the lateral effect is constant as I wrote above, why does its effect on skin friction vary with depth? Or it doesn't?