In-situ investigation of deformation properties of soft saturated clayey soils.

The paper describes the issues concerning the investigation of the deformation properties of the soft saturated clayey soils by means of static sounding and dynamic probing, as well as plate bearing test. It is indicated that with using static sounding and dynamic probing, the reliable deformation characteristics of soils can be obtained. The paper presents the static sounding and dynamic probing procedures that are currently used in Russia. The plate-bearing test utilizing various in size bearing plates is also described in the paper. The procedure for obtaining the necessary results is described, methods for evaluating the results are considered, and the main key points of these studies are given. The article draws conclusions. It is indicated, that on the basis of the numerous field investigations carried out during the time period of 1992-2020, it appeared impossible to establish a robust agreement between the deformation characteristics of soft saturated clay, determined using static sounding and dynamic probing tests, and those determined using the plate-bearing test performed with the bearing plates of 600, 3000 and 500 sq. cm, as well as deformation characteristics obtained from the laboratory tests results [ABSTRACT FROM AUTHOR]