The main intention of this master thesis was to present the liquefaction phenomenon, which occurs in loose saturated sands and silty sands during dynamic load (e.g. by earthquake). Due to the increase of pore pressure during loading, effective stresses decrease and soil loses its shear strength. The increase of pore pressure is dependent on wide range of factors such as grain size distribution, relative density, permeability, age of layer, degree of saturation, groundwater level, intensity of earthquake, etc.
To analyse the susceptibility of soil deposit upon liquefaction phenomenon it is necessary to evaluate the intensity of dynamic loading due to seismic oscillations in terms of cyclic stress ratio (CSR) and soil resistance by using cyclic resistance ratio (CRR) on the basis of in-situ or laboratory tests. Various methods for evaluating CRR ratio based on SPT, CPT, DMT investigations or shear wave velocity data are presented in this thesis.
Thesis contains a comparison of individual methods using data from in-situ tests collected from three different locations namely from HPP Brežice test site, oil terminal Porto Romano in Albania and Çanakkale city in Turkey.