Tunnel Lining Plots

 

▒ Overview

IMG_C_ICON_DOT.gifThis tool allows the user to generate capacity curves for composite lining for tunnels using Carranza-Torres and Diederichs Method* (2009).

 

▒ Methodology

TABULAR INPUT

 

 

CAPACITY CURVES OUTPUT

 

The user can calculate the Equivalent Section properties of the Composite Lining and can draw the Demand - Capacity plots (M-N & Q-N) of Steel Sets/Ribs/Lattice Girders and Shotcrete separately using the Bending Moment (M), Shear Force (Q) and Axial Force/Hoop Force (N) obtained from the analysis. 

 

Material Properties

  • The user inputs of material properties are inputted in here.

Steel Properties

  • Enter the strength parameters for lattice girder or steel in here.

  • Unit system : Specify the force/length/time unit system used for analysis. Use the Unit converter at the bottom right to convert the units before or after analysis.

Section Properties

  • The user inputs for dimensions are inputted in here.

Shotcrete Properties (Strength Parameters & Section Data)

  • Similar to the steel section properties, in these tabs, the user can input the stiffness parameters and dimensional attributes of  the shotcrete liner.

 

General Parameters

  • The user can input the total liner  thickness in this tab.

  • The FoS needs to be defined, the user can also input multiple values of FoS with a space e.g (1 1.5 2).  

Equivalent Properties

  • Equivalent Section Thickness (teq) and the Equivalent Modulus Of Elasticity  (Eeq)   will be calculated by the tool and the output will be shown.

Input Forces

  • Enter the Bending Moment (M), Shear Force (Q) and Axial Force/Hoop Force (N) inputs from the analysis here.  

Redistributed Forces

  • The redistribution of forces to steel and concrete based on the inputs provided on the material and section tabs, along with the Input Forces will be illustrated here in the tabular format.  

View Curves

  • Clicking this option will show the M-N and Q-N curves for  steel and concrete.

Generate Report

  • This option allows generation of a comprehensive report for the tool output in .docx format as shown below:   

 

* Hoek, Evert & Carranza-Torres, Carlos & Diederichs, Mark & Corkum, Brent. (2008). Integration of geotechnical and structural design in tunnelling. Proceedings University of Minnesota 56th Annual Geotechnical Engineering Conference. 1-53.