curve load settlement for raft pile foundation

I modeled a raft pile foundation with a surface load, in stage construction I created the various phases, 0 1 2, in phase 1 I activated the interfaces etc. 
and in phase 2 the surface load, then I want the displacement load curve, but when I select the stages in x and uz displacements in y, I get a straight line
because there are only 3 steps of calculation,but I want to get the curve, how should I do, I also tried to change the load as well but the result is always a straight line.