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Rock Mechanics pp 799-835 | Cite as

In-situ Stresses

  • Walter Wittke

Abstract

The state of stress existing in the rock mass prior to any construction work is referred to as the in-situ or primary state of stress. A knowledge of this state is important to the planning and construction of engineering structures in rock. Chapters 11, 12 and 13 in particular demonstrated the considerable influence exercised by the in-situ state of stress on the deformations caused by excavation, on the loading of any support and therefore on stability. Thus, for example, the type and magnitude of the loading experienced by the shotcrete lining of a tunnel or cavern depend largely on whether the rock mass in its undisturbed state is Ioaded primarily in a vertical or horizontal direction (Sections 11.3 and 12.3). The loading of the lining of a tunnel in a swelling rock mass also depends heavily on the in-situ state of stress (see Section 11.7). The number of examples illustrating the influence of the in-situ state of stress on the stability of engineering structures in or on a rock mass may be extended at will.

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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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