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Rock Mechanics pp 417-503 | Cite as

Traffic Tunnels and Adits

  • Walter Wittke

Abstract

The driving of a tunnel or an adit leads to a stress redistribution in the rock mass. Loading which passes through the rock mass in the area of the tunnel cross-section in front of the working face must, by completion of construction, be diverted around the opening. The example in rig. ilni of a tunnel in a rock mass loaded predominantly in the vertical direction by dead weight demonstrates that, even in the case of a medium overburden, this may no longer be accomplished via a shotcrete support alone if this is to be, designed economically. The majority-of the load is in fact carried by the rock mass to the side of the opening and the support plays only a secondary role [11.5]. Accordingly — as already stressed several times — stability analyses of openings must, above all else, take into consideration the load-carrying action of the rock mass and thus also its stress-strain behaviour. The analysis procedure presented in Chapter 6 has proven to be a valuable aid in this respect and therefore its application to stability analyses in tunnel and adit construction will be discussed in greater detail.

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References

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Copyright information

© Springer-Verlag Berlin Heidelberg 1990

Authors and Affiliations

  • Walter Wittke
    • 1
  1. 1.Institut für Grundbau, Bodenmechanik, Felsmechanik und VerkehrswasserbauRWTH AachenAachenGermany

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