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1 2024

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Geologiczno-inżynierskie właściwości namułów z Czosnowa

Rau-Sierańska Julia, Zawrzykraj Piotr

Przegląd Geologiczny

2024

Vol. 72, nr 12-2

838--845

Young cohesive sediments that fill oxbow lakes are often classified as weak-bearing soils. They require direct investigation of their parameters and properties for reliable engineering and geological characterization and correct assessment of their interaction with construction structures. The research program included static and dilatometric soundings, oedometer tests and determinations of basic physical properties. From the granulometric point of view, the studied soils have been found to be clay (average content of clay fraction about 36%). Their average liquidity index is IL = 0.62 and natural moisture content is 58.7%. Oedometer tests showed that the range of compressibility modulus values Eoed varied between 0.17 and 1.97MPa (average 0.9 MPa). As a result of the comparison of oedometer compressibility modulus and CPTMstatic sounding, a correlation between cone resistance and Eoed modulus was proposed. Correlations between MDMT modulus and cone resistance qc, as well as between Eoed oedometer modulus and MDMT dilatometer modulus are also presented. Macroscopic, preliminary assessment of the studied sediments of gray and dark gray color, indicating organic soils (muds according to the PN-B-02480 standard) has proved to be incorrect, as laboratory tests of organic matter content by the hydrogen peroxide digestion showed an average organic matter content of about 1.9%. The problem of interpreting the origin of the studied soils as intermediate sediments between lake sediments (oxbow lake sedi¬ments) and muds, mainly fed from the water column during the Vistula floods, was pointed out.