参考:Advancing Lined Tunnel with Slip (using linerSELs)
; --- Add shotcrete
sel liner id=1 range cyl end1 0 0 0 end2 0 1.01 0 rad 1.0
; --- Specify symmetry conditions for nodes along the 3 symmetry planes
sel node local xdir 1 0 0 ydir 0 -1 0 range x -0.1 0.1
sel node fix lsys range x -0.1 0.1
sel node fix x yr zr range x -0.1 0.1
sel node local xdir 0 0 -1 ydir 0 -1 0 range z -0.1 0.1
sel node fix lsys range z -0.1 0.1
sel node fix x yr zr range z -0.1 0.1
sel node fix y xr zr range y -0.1 0.1