Hi everyone,
I am modeling a staged MSE wall constructed lift-by-lift on a deformable foundation soil in FLAC3D.I am facing a second issue related to the wall–foundation interface. The wall base is intended to interact with the foundation soil (i.e., it is not fixed). However, FLAC3D reports the messages “No faces fell within the range” and “No valid interface nodes in range”, even though the wall base and the foundation top geometrically coincide at . In my model, I create two separate brick zone blocks: one for the foundation soil and another for the MSE wall. I need to define an interface between these two layers such that the MSE wall responds to foundation soil deformation—meaning that when the foundation soil settles, the MSE wall settles accordingly. My current approach is as follows. First, I attach the wall bottom to the foundation top so that they share common faces over the intended contact area. Then, I attempt to create an interface by separating those shared faces over the same spatial range and assign the interface properties (normal and shear stiffness, friction angle, and cohesion). I am using the following syntax:
zone attach by-face range position-z 0.0 position-x 0.0 12.19 position-y 0.0 9.14
zone interface ‘WallFoundation’ create by-face separate range position-z 0.0 position-x 0.0 12.19 position-y 0.0 9.14
zone interface node property stiffness-normal 5.0e7 stiffness-shear 5.0e7 … friction 30 cohesion 8740 range group ‘WallFoundation’
Despite this, the interface is not being created successfully, and FLAC3D reports: “+++ No valid interface nodes in range.” and “+++ No faces fell within the range.”
I would appreciate your guidance on whether this issue could be related to face ownership, zone ordering, geometric tolerance, or the sequence in which the attach and interface-creation steps are applied.
Thank you for your time and support.