GEOTECHNICAL PROPERTIES OF NEOGENE SUBSOIL OF THE DANUBE RIVER IN BRATISLAVA.

In the framework of reconstruction of the Old Bridge, two exploratory wells were made in the channel of the Danube River. The depth of the exploratory wells was up to 55 m below the modified terrain around the bridge pillars. The role of the exploratory wells was verifying the thickness of Quaternary sediments and simultaneously verifying Neogene soils properties located in the channel of the Danube River. The exploratory wells verified that the Neogene subsoil of the Danube River is predominantly made up of silty-clayey soils of intermediate to hight plasticity locally alternated by sandy positions. The paper presents the results of experimental measurements not only index characteristics, but also the shear strength and compressibility parameters of Neogene soils forming the subsoil of the Danube River in Bratislava. The paper presents in detail range of grain composition of Neogene soil samples, location of Neogene soil samples in plasticity diagram, the average shear strength parameters of individual types Neogene soils, the average shear strength parameters of all samples Neogene soils, example evaluation of oedometer compressibility test of Neogene soils, change oedometric modules of Neogene soils depending on the sampling depth. The functional dependencies of the change of oedometric modules with the depth of sampling from the Neogene subsoil are expressed. Experimentally verified parameters of the Neogene subsoil served for the design of the reconstruction of the pillars of the Old Bridge across the Danube River in Bratislava. [ABSTRACT FROM AUTHOR]