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  Geological and geotechnical surveys in tectonically active rock masses

  The excavation of tunnels in rock masses in which are identified characteristics of tectonic activity requires the adoption of special geological and geotechnical survey procedures. This particular attention arises from the need to prevent any risk of undesirable behaviors during to the excavation works and its following impact on costs and deadlines. Under these conditions is the design of some tunnels in India, interfering with the rock masses assigned to the wrinkling of the Himalayas, where they will be excavated. In this article are discussed the major problems that were put to the geological reconnaissance and the guidelines followed on the geotechnical characterization and surveys, as well as the presentation of the geological and geomechanical models followed in the design studies.

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