Uncertain outcomes of geotechnical work illustrated with the example of a road tunnel

This paper presents a number of factors which influence the design and construction of a geotechnical structure, i.e. a road tunnel. For this type of structure, it is necessary to thoroughly examine the geological conditions and the properties of the rock mass. Research carried out on the basis of drilling gives only local results, which consequently only provides an estimated description of the characteristics and properties of the rock mass