Name: Waldemar Świdziński
Tejchman A., Gwizdała K., Świdziński W., Brzozowski T., Krasiński A.
Stateczność i ochrona klifów polskiego Wybrzeża
publisher: Wydawnictwo Politechniki Gdańskiej
published in: 1995
Mechanizmy zagęszczania i upłynniania gruntów sypkich
publisher: Wydawnictwo IBW PAN
published in: 2006
Summary: The book comprises empirical analysis and simple theoretical description of processes governing deformation of dry granular media and their undrained behaviour when they are fully saturated. The processes were investigated in the laboratory for stress states corresponding to oedometric conditions, simple shearing and traixial compression. In each case the soil response was examined for monotonic, as well as cyclic loads. Considerable attention was paid to the empirical identification of elastic response of granular media. Two original methods of the determination of elastic properties for such materials were proposed. The methods were based on the interpretation of oedometric and triaxial tests. It was shown that the definitions of elastic moduli commonly used in geotechnics do not correspond to classical theory of elasticity and the moduli values based on such definitions are wrong. The main part of the book was devoted to the analysis of irreversible deformations, the significant role of which play volumetric deformations related to compactionor loosening of dry, non-cohesive soils or to pore-water generation and liquefaction in the case of saturated ones, in undrained conditions. Basic mechanisms governing the compaction and pore water generation processes were experimentally identified and verified, such asidea of steady-state of deformation and contractivity and dilativity concepts of non-cohesive soils. Based on the test series carried out in the triaxial apparatus new stress characteristics named the instability line, was identified. It was shown that the new line, which lies within the yield surface plays a fundamental role in the case of liquefaction phenomenon for contractive soils, regardless of the load type (monotonic or cyclic).