The FEM - Tunnel is used to design and analyse tunnels. It include a specialised tools for the definition of tunnel lining, system of anchors and rock bolts and grouting-strengthen regions. The relaxation factor assigned to each construction stage takes the 3D effect of the excavation into account. 
Tunnel is an extension module of the FEM program for the analysis of general geotechnical problems. 
Licence price from £2348 
Available in packages: 
NATM method 
Support bolts 
Triple-vaulted metro station 
Main Features 
Two options for modelling linings (Beam elements - 1D or standard 2D elements) 
Option to create a geometrical model of the lining in a separate pre-processor using data in an external format (such as DXF). 
Simple introduction of lining into the soil/rock body - topology correction and mesh generation are fully automatic 
Any number of construction stages 
Use of a relaxation factor to model the 3D behavior of the body during excavation 
Introduction of hinged bearing ends of the beam elements 
Input of temperature loads on the beams 
Consideration of soil swelling 
Consideration of lining shrinkage 
Analysis of a secondary lining either by changing the geometrical parameters (1D elements) or by changing the parameters of the original lining to allow for the transfer of stresses (2D elements) 
Introduction of monitoring points anywhere in the body 
Graphical representation of the distribution of internal forces on active parts of the lining 
Automatic generation of anchors fixed to the lining 
Introduction of anchors as a region of improved soil mass (anchored region) 
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