ABSTRACT
In Warsaw region, in general, differential Quaternary overburden (1-100 m thickness)—mostly glacial deposits-covers a layer of Tertiary clays. The processes of soil erosion connected with forming the river net as well as a glacitectonic deformation effects in this region appeared in geological past. The decompression, erosion and weathering processes followed. As a result of these processes the soil body, especially Tertiary soils in Warsaw are non-homogenous with discontinuities and contain lots of lenses of different lithology often with water under high pressure. Therefore it is difficult to properly asses design parameters of theses soils.
