Deep Mix Column

I have modelled Deep Mix Column under embankment loading. 

In this modelling, I have made a negative interface around the DM column and assigned property custom [ DM Col-MC model_Drained_E_v_c_phi-r inter-0.69]. 

When I hit calculate button in stage construction, it took too much time to solve but it didn't work as per the research paper.

How can I solve this problem?

Please see the attached screenshots...

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