Design of a Tunnel Composite Lining

[gianniorlati]

Integration of geotechnical and structural Design in Tunnelling

Author: E. Hoek, C. Carranza Torres, M. Diederichs | Size: 168 MB | Format: PDF | Quality: Unspecified | Publisher: University of Minnesota | Year: 2008 | pages: 7 | ISBN: n.a.

In a typical tunnel design in which support consists of steel sets embedded in shotcrete, the designer needs to know the contribution of each of these support elements and to be able to adjust the number and dimensions of each to accommodate the loads imposed on the lining.
In current tunnel design, these loads are obtained from numerical analyses in which “beam elements” are attached to the tunnel boundary and the axial thrust, bending moments and shear forces induced in these elements are computed directly.
Note that these beam elements constitute “tunnel support” and they interact with the surrounding rock mass to limit the convergence of the tunnel. On the other hand, rockbolts
act as “tunnel reinforcement” in that they change the mechanical properties of the rock mass surrounding the tunnel. Hence, it is possible to carry out a numerical analysis of a tunnel reinforced by means of rockbolts and supported by means of a composite lining. The loads imposed on the lining will be reduced by the reinforcement and the composite lining will respond to these reduced loads. The analysis that follows is valid whether rockbolts are present or not, provided that the numerical analysis correctly models the load transfer from the rock mass onto the lining.

Code:

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Includes Excel spreadsheet for the design of a composite tunnel lining after the determination of the internal actions values to be seperately carried out by means of close-form solutions or numerical methods-based techniques.

Code:

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