The Wizard creates a simple 3D tunnel model easily. It can be used to model a 3D tunnel model that considers the undisturbed stratum and ground surface.

The Wizard is made up of 4 tabs: 1)General, 2)Shotcrete & Rock Bolts, 3)Excavation and 4)Mesh. The data in all 4 tabs need to be properly input to create the tunnel model. Because everything up to the material selection can be conducted at once, the Tunnel Wizard menu can be used immediately without any separate processes after running FEA NX. The data can be set as the default wizard data, or a separate Tunnel Wizard save file can be created. This allows for fast modeling when analyzing similar tunnels; only certain variables need to be modified for the existing tunnel model.  

The Tunnel Model Wizard cannot be used if the modeling is not done. If a model exists, the Tunnel Model Wizard cannot be executed.

General

Input the number of tunnels and tunnel shapes, and set the excavation method.

First, decide whether to model the full tunnel face or the half(right) of the full tunnel face. Be aware that the specified construction stages and result data etc. cannot be used if the model, created using the Tunnel Modeling Wizard, is modified later.

[Shape]

Determine the tunnel shape. Circular, 3 Center circle, 5 Center circle shapes are supported. The dimensions specify the tunnel changes, depending on the specified tunnel shape. Set the input guide to display the relationship between the tunnel shape and input values on the Tunnel Wizard dialog box. The guide can be used as a reference when entering the variables. The input values for the tunnel shape are the same as for Geometry > Point&Curve > Tunnel (Wire).

<Circular>                                <3 Center circle>                                      <5 Center circle>

[Property]

Input the ground material around the tunnel. If the tunnel model is created using the Tunnel Wizard, a basic rectangular ground shape can be created around the tunnel and the upper stratum and index shape can be added to the model optionally. A basic model is the rectangular ground shape on the periphery of the tunnel. The basic shape can be composed of a homogeneous material. The material and properties are the same as the specified Material property in Property/Coordinate and System/Function.  

[Excavation Method]

Determine the excavation method for the tunnel section. FEA NX supports the section shapes for [Full Face Cut], [Bench cut 1], [Bench cut 2], [Ring cut 1], [Ring cut 2] and [3D cut]

<Full face cut>                                     <Bench cut 1>                                         <Bench cut 2>

<Ring cut 1>                                     <Ring cut 2>                                              <CD cut>

Shotcrete & Rock Bolts

The Shotcrete & Rock Bolts tab determines the generation of shotcrete and rock bolts, type and material, arrangement, shape, etc.

The generation of shotcrete, soft shotcrete and rock bolts can be set using the checkbox. Shotcrete and soft shotcrete are specified as plate elements and rock bolts are specified as embedded truss elements.

The material and properties are the same as the specified Material Property in Property/Coordinate System/Function. The properties of shotcrete & rock bolts must be specified as a structural property.

[Add Shotcrete to the Intermediate Wall]

If the 3D cut tunnel excavation method is activated, the installation of shotcrete on the intermediate wall can be decided.

[Rock Bolts]

Input the number, division length and spacing between rock bolts (Tangential pitch).

• Staggered Disposition

This option determines whether to place the rock bolts in an intersecting array for each construction stage. Setting +1 creates the set number of rock bolts in the first construction stage, an extra rock bolt is added in the second stage, and the number returns back to the set number in the third stage. Setting -1 creates the set number of rock bolts in the first construction stage, a rock bolt is removed in the second stage, and the number returns back to the set number in the third stage.

The [Add Rock Bolt to the Intermediate Wall] option is activated when the tunnel excavation method is set as 3D cut, and determines whether to install a rock bolt on the center wall.

         <Rock bolt>                               <Add rock bolt to center wall>

[Input Guide] or [Drawing] can be used to check the drawn section shape in real time.

Excavation

Determine the tunnel excavation for each construction stage.

Select the excavation type, whether to excavate in one direction or in both directions. For both directions, the program creates the construction stages until the tunnel is perforated. After this point, the user needs to create the construction stages directly.

When modeling 2 tunnels, specify the tunnel to be excavated first.

[1st Excavation Tunnel]

Input the stage spacing for shotcrete and rock bolts after excavation. For example, if 1 is inputted, the shotcrete or rock bolts are created in the subsequent stage after excavation. When creating soft shotcrete, the soft shotcrete is created in the specified stage and then stiffens in the next stage.

[2nd Excavation Tunnel]

Input the excavation stage for the second tunnel in the case of two tunnel construction. For example, if 2 is inputted, one tunnel is excavated and the next tunnel is excavated 2 stages later. The shotcrete and rock bolt creation point is determined by the specified value in Define Stages after the 1st Excavation.

[Advancing Length]

Specify the excavation length for each construction stage. Entering advancing length automatically calculates and displays the total tunnel length. The excavation length for each construction stage is input using commas or spaces. Repeating lengths can be input using number@length. For example, if the excavation is done for lengths of 2,2,2,2,3,4, input ‘2,2,2,2,3,4’ or 4@2,3,4.

Divisions are the number of created elements in the excavation direction for each excavation stage. If loading is needed, click the  button to input the load distribution factor for each stage.

[Rock Bolt Location]

Input the rock bolt creation location for each construction stage. Rock bolts can be automatically created at the center of the excavation length of each stage and the user can directly input the pitch and angle to adjust the creation location.

[Pitches] expresses the rock bolt creation location using the start portion of the tunnel and the rock bolt creation location of the previous stage.

[Angle] is the angle between the tunnel length direction and the rock bolt.

Mesh

Input the mesh shape, strata and ground surface shape.

For the tunnel location, the model depth, the distance from tunnel floor to the lower boundary of the model, the distance from the tunnel to the left/right boundaries of the model, and the distance between tunnels for 2 tunnel construction can be input.

Each boundary distance is input as a multiple of the tunnel floor width.

[Ground Modeling]

Model the upper stratum. The upper stratum can be modeled using the [Actual] or [Load] methods.

The [Actual] method creates real meshes to conduct modeling. The [Load] method does not model the ground surface shape directly, but processes it as a pressure load.

The reference height is the [Base Elevation] on which the input values from the created stratum or terrain will be added.

[Strata]

The stratum exists above the upper part of the tunnel, and multiple strata can be created using the [New] button. The material and properties are the same as the specified material property in Property/Coordinate System/Function.

• x

Input the stratum shape following the model width direction. Input the width coordinates in the x direction. The origin is located at the bottom left corner of the tunnel as viewed from the front.

• Value

Input the height value at each x coordinate position. Input the x coordinate and value to draw the input shape on the right.

• z

Input the stratum shape following the tunnel direction. Input the tunnel length direction coordinates in the z direction. The origin is located at the bottom left corner of the tunnel as viewed from the front.

• Offset

Input the height value at each z coordinate position. The height value is the change in height respective to the previous value.

[Terrain]

Model the terrain. The terrain is generated using virtual grids identical to the grid face. The height is input at the grid intersections. The terrain height on a text file can be imported or the height can be input directly.

The material and properties are the same as the specified material property in Property/Coordinate System/Function.

[Mesh Size]

Input the size of the mesh created in the tunnel. For the tunnel (Interval), the user can input the mesh size directly. The mesh boundary is input as a multiple of the created mesh size. Using the automatic setting sets the boundary element size automatically.

Open

Open a saved Tunnel Wizard file (*.wzd).

Save as

Save the entered values in current Tunnel Wizard as a Tunnel Wizard file (*.wzd).

Save Default Data

Set the current input values as the default values of the Tunnel Wizard.

Open Default Data

Delete all current input values and reset to the default values of the Tunnel Wizard.