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  GeoBIM for handling geological and geotechnical uncertainties in tunnelling

  In tunnelling, still unforeseen conditions concerning the geological environment is the main reason for claims. Excluding water, the uncertainties are basically of two kinds – geometrical and design values – e.g., rock coverage or rock quality. A new method has been developed for handling the geometrical uncertainties in tunnelling projects. The method is based on the GeoBIM concept for efficient information handling. The total uncertainties of a certain geometrical feature, i.e., a bedrock model, is based on 1) individual uncertainties which are assigned to each data point when it is imported to the database, and 2) the distance to the nearest investigation point. The algorithm is successfully validated with five uncovered and surveyed bedrock surfaces in three infrastructure projects in Sweden.

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