The tunneling process demonstrated in tutorial-7 within Plaxis 3D

Question

We used tutorial-7 in Plaxis 3D to model the tunneling. We cut the section in the y-direction to create the Figure (attached). 
 How can we prevent the initial settlement in the tunneling model? 
 
 Thank You in Advance

Dennis Waterman · Answer

Dear Nattavich, 
 It's not clear what tutorial you're referring to, because the tunnel tutorial in the PLAXIS 3D manual is tutorial 5 and not tutorial 7. Also, the tunnel tutorial has only 5 calculation phases and in your graph you're referring to phases 17, 30, 40, 50 and 55. Finally, I would like to point out that tutorial exercises are to demonstrate functionality of the software and should NOT be used as basis for a real project. 
 With kind regards, 
 Dennis Waterman