  The immersed isogeometric Boundary Element Method is presented and applied to
the simulation of underground excavations. Nonuniform rational B-splines
(NURBS) are used for the accurate definition of complex geometries with few
parameters. Immersed technology is applied to automatically generate cell
meshes. This allows heterogeneous and anisotropic ground conditions as well as
nonlinear material behaviour to be considered. On a practical example the user
friendliness and accuracy is demonstrated.
