THE EFFECT OF DYNAMIC LOADINGS ON THE SHEAR STRENGTH OF WARTANIAN GLACIATION TILLS FROM WARSAW-SŁUŻEW AREA
Journal Title: Biuletyn Państwowego Instytutu Geologicznego - Year 2011, Vol 446, Issue 446
Abstract
The paper presents the result of series of laboratory monotonic and cyclic triaxial tests carried out to study the effect of cyclic loading on the shear strength of till deposits from Nowoursynowska testing field in Warsaw. Electromechanical dynamic triaxial testing system (DYNTTS) was used to investigate the undrained shear strength of undisturbed soil samples. The till samples were subjected to two-way cyclic loading with 10 Hz frequency under displacement control condition. An excess pore water pressure, due to low permeability of tills, is likely to be generated under cyclic loading and consequently the post-cyclic shear strength decreases when the effective stress gets reduced. Cyclic loading causes a substantial reduction in shear strength of tills. Post-cyclic shear strength of studied till is equal to 21–76% of its static shear strength.
Authors and Affiliations
Anna BĄKOWSKA
Keywords
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