1. When I simulated the process of caisson excavation and subsidence, there would be a cycle process of excavation-sinking-excavation, which is embodied in plaxis3D as freezing the soil inside the caisson and changing the soil material at the position of the caisson to the caisson material. However, the problem of soil mesh pre-deformation will cause the newly activated caisson to continue the soil pre-deformation there. How can I solve this problem?2. In the process of tunnel excavation, there will be pre-deformation of the soil grid in front of the tunnel. When the tunnel passes through there, the lining needs to be activated, and the lining will also continue the original soil deformation. I wonder why everyone does not consider this problem, is it the reason that the soil grid pre-deformation size is very small?3. Can the displacement of each stage be reset to 0 to solve this mesh pre-deformation problem? (You need to manually overlay the results of each stage in the post-processing phase)
At the end, there is an exaggerated deformation diagram to show how large the predeformation of the underlying soil is and how large the unreal deformation of the caisson is in the next stage
The predeformation has no influence on the internal forces. Predeformation does not give internal forces, it only determines the initial position of the nodes. Further deformation is not influenced either since deformations and/or forces are always calculated incremental relative to the undeformed mesh. Hence, it only doesn't look very nice, but apart from that it is not really a problem.With kind regards,
Dennis WatermanP.S. I'm not a teacher, please don't call me like that.
Answer Verified By: xin Fang