Soil-Structure Interaction

[nimatehran]

Hello;

I need an example for modeling soil beneath the raft foundation (mat foundation) in "3-Dimensional" Space. By spring elements or by quad element. It should be noted that "ShalloFoundationGen" Command in opensees that released by Dr. Raychowdhury is a very good command that models the foundation and the soil in 2-Dimensional space, but i want to model the raft foundation in 3-dimensional space .Can anyone help me?

With best regards