GTS NX Created April 14, 2025 04:29 Edited April 29, 2025 03:37

[GTS NX] How to Account for Volume Loss in TBM Tunnels

Question

How to Account for Volume Loss in TBM Tunnels

Answer

Volume loss in a TBM tunnel can be considered by applying shrinkage or simulating a contraction around the tunnel lining. This can be implemented by selecting the relevant beam or shell elements in a 2D or 3D model.

The ‘Contraction’ parameter represents shrinkage in the circumferential direction of the tunnel.
The ‘Contraction Inc.’ parameter accounts for shrinkage in the longitudinal (excavation) direction of a 3D tunnel.
The ‘Rep. Depth’ (Representative Depth) defines the reference depth used to calculate this shrinkage in the excavation direction.

To apply this contraction, a value is specified as a strain percentage.

Contents Article Map

[GTS NX] Procedure to Import a CAD File into GTS NX [GTS NX] How to add an offset to structural elements? [GTS NX] How to add end release to the shell elements? [GTS NX] How to search for specific node/element? [GTS NX] How to Disassemble a Shape into Sub-Shapes? [GTS NX] How to Scale Geometry? [GTS NX] How to Change Property in construction stage? [GTS NX] How to Obtain Volume Data? [GTS NX] How to Obtain Local Factor of Safety in Slopes? [GTS NX] How to Account for Volume Loss in TBM Tunnels