Wybrane zagadnienia dotyczące budowy tuneli z wykorzystaniem zmechanizowanych tarcz zawiesinowych

The major criteria which determine selection of tunneling technology with use of tunnel boring machine (TBM) technique concern geotechnical an hydrogeological conditions of a site. When subsoil strata does not consist of rock the soils are group in two categories, i.e. coarse grained and fine grained soils. Determination of geotechnical parameters pertinent to the problem of tunneling requires individual approach in each case. In case of slurry shield technique, calculations of pressure required for face support should account for real loading conditions. In particular, with respect to shear strength, drainage conditions should be properly accounted for. Thus determined shear strength should be assigned to properly distinguished soil layers. The proper division of soil strata into soil layers is also discussed in the paper.