Compressibility of quartz sand from the Lithuanian coastal area in Klaipėda environs is investigated by testing and numerical simulation, with validation of obtained results. The shape of sand grains has been analysed with a scanning electronic microscope (SEM). The determined morphological parameters of sand grains are employed to create discrete models (particle models of grains) subsequently used for sand compression test numerical simulation via discrete element method (DEM) techniques. The background version of DEM and the numerical time-integration algorithm are implemented in original DEMMAT code. Compression tests have been realised by an oedometer device. Test versus numerical simulation results have revealed a dependence of significant compression curve character on the discretised shape of sand grains and Young's modulus of particles.

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The paper analyses problems of correlation between the results of dynamic probing (DPSH -Super heavy dynamic probing) and cone penetration test. According to investigations of geological cross-sections of cohesive soils of the territory of Lithuania correlation dependencies are evaluated. Reliability of dynamic probing and modern methods of results correction are discussed. Effect of DPSH rods and lateral stress of soils to the results of probing is evaluated. Correlation dependencies between blow count N and depth of probing and cone resistance q c for various cohesive soils found in the territory of Lithuania.