RS2 Applications

Tunneling


RS<sup>2</sup> Tunnels Applications


RS2 is widely used for the analysis and design of underground tunnels. Applications include tunneling in hard rock, weak rock, jointed rock, and soft ground. Multi-stage analysis and advanced support design tools simplify the design of tunnel lining systems.

The new Tunnel Wizard also simplifies the modeling of different tunnel shapes, by allowing the user to quickly create tunnel boundaries based on common pre-defined shapes with user-defined parameters. There are also four support capacity envelope options. In addition to the Carranza-Torres & Diederichs method, users can now plot strength envelopes according to CSA A23.3, ACI 318-11, Eurocode EN 1992-1, or Unfactored.

See each of the listings below for more details:

This example demonstrates the use of RS2 for the back analysis of a tunnel in soft ground. The Aeschertunnel in Canton Zurich, Switzerland, a large non-circular shallow tunnel, was excavated with a top heading (75m2) that utilized 35 sub-horizontal jet-grout columns for primary excavation support. The tunnel was designed to accommodate highway traffic with a completed cross sectional area of 135m2. The tunnel was excavated in glacial till (a relatively dry medium-dense silty sand) at a depth that caused surface settlements.

A numerical back analysis was performed using the finite element program RS2 . The back analysis procedure using RS2 was to vary the model parameters starting from a set of base parameters in order to get the best agreement between observed surface settlements and model settlements.

For details see the following paper:
Ground Deformations Above a Large Shallow Tunnel Excavated Using Jet Grouting
This example presents a detailed case study of tunnel support design requirements utilizing a variety of tools including RS2 analysis.

For details see the following paper:
The 2008 Kersten Lecture: Integration of geotechnic and structural design in tunneling
This example presents a case study on a shallow cover driven busway tunnel under heritage-listed buildings on shallow footings. RS2 (in design), Unwedge and Dips were used extensively. The latter two packages were used extensively during tunnel excavation.

For details see the following paper:
Shallow Cover Tunnel Under Heritage Listed Brick Buildings
In this example, a method of tunnel lining design is described using support desing tools available in RS2. Support capacity plots are used to ensure that liner loads remain within the design factor of safety of the liner.

For details see RS2 Tutorial #24:
Tutorial #24 - Tunnel Lining Design

For an additional example of tunnel support design see RS2 Tutorial #18:
Tutorial #18 - 3D Tunnel Simulation using Core Replacement

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