ABSTRACT
The geological sequence in the area is shown in Fig. 2. From the stratigraphical point of view, the area is formed by Miocene marine deposits of the Carpathian fore-trough, the thickness of which reaches several hundreds meters in this location (Pavlík et al. 2004). The top part of the overburden consists of anthropogenic materials. The natural Quaternary cover consists of loess loam and clayey loam with the thickness of 3 to 10 m. The base of the Quaternary cover is formed by a discontinuous layer of fluvial sandy gravel, often with a loamy admixture. The majority of the tunnel is driven through the Tertiary calcareous silty clay. The clays are of stiff to very stiff consistency and high plasticity.
