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TUNA plus is the NATM (New Austrian Tunneling Method) tunnel analysis program which is specially designed to be used for practicing engineers in the fields of tunnel design, construction, or supervising. TUNA plus has fully automated built-in pre, main, and post processors so that users having no numerical analysis background can analyze NATM tunnels. TUNA plus runs on IBM PC compatibles under Dos or Windows 95.


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  • Nonlinear Liner-Medium Interaction
  • English and Metric Units
  • Geometry of Tunnels;

    * Single Tunnel (Half Section)
    * Single Tunnel (Full Section)
    * Symmetric Two Tunnels
    * Unsymmetric Two Tunnels

  • Multi-Layered Geological Medium
  • Liner Loads; Weight, Water Pressure, Loosening Load and Support Degradation
  • Circular, Horseshoe, or User Defined Tunnel Shapes
  • Plain Concrete and Reinforced Concrete Liners
  • Multi-Staged Excavations
  • Shocrete and Rock Bolt Installation
  • User Friendly Input Window

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Graphical Outputs

  • Ground Surface Settlement
  • Tunnel Deformed Shape
  • Principal Stress in the Surrounding Medium and Shotcrete
  • Contours of Safety Factor
  • Axial Stresses of Rock Bolt
  • Deformed Shape of Liner
  • Bending Moment, Thrust, and Shear in the Liner
  • Stresses in the Reinforcing Bars
  • Stresses in the Extreme Fiber of the Liner
  • Displacement History at Ground Surface, Tunnel Crown, Spring Line, and Invert.

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