Strain and fi ltration parameters of lacustrine chalk from Mazury District. In this paper the strain and fi ltration parameters of lacustrine chalk from Mazury District are presented. To determinate the main engineers’ parameters the oedometer tests have been obtained. There were two types of laboratory tests: IL standard one and CLR – with the constant loading. The tests were performed on lacustrine chalk from Mazury District in North East Poland. The tests results allowed to describe relationships between stain and vertical effective stress. Also the relationship between constrained modulus and vertical effective stress with the most correlated equation was proposed. The relationship between fi ltration coeffi cient and void ratio was obtained. The constitutive equation for the relationship between fi ltration coeffi cient and void ratio was proposed: k = 1,0 · 10–12 · e3,5, where: k – fi ltration parameter, e – void ratio. Strain and fi ltration parameters obtain from laboratory oedometer tests proved the nonlinear relationship between stress-strain and stress-fi ltration.
The infl uence of loading rate on deformation of organic soil. In this review paper the changes of deformation parameters in the organic soils characteristics are presented. The main view was put on the infl uence of loading rate on presented soils. The results of soft soils used to the analysis were obtained in laboratory using oedometer tests. To describe the deformation process of organic soils two kinds of oedometer tests were held: with gradually increasing load and constant load. Both techniques show the wide range of factors determine deformations and settlements of organic subsoil, among which important are also the velocity and the value of loading rate.