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Budowa wewnętrzna moreny czołowej glacitektonicznie spiętrzonej kompleksu Dębowej Góry : stanowisko Krostkowko

100%

Ratajczak-Szczerba M.

tom Vol. 16

115-123

The outcrop in Krostkowo, located in the western part of Dębowa Góra (Oak Mountain) Complex - the highest point of Wyrzysk Oscillacion end moraines. There were recognized two till layers, with glacitectonic disturbances, divided outwash deposits with glacial tills incorporations. There were recognized textural, structural features and petrographic composition of glacial tills.

Stratygrafia, geneza i wiek osadów lodowcowych Wysoczyzny Krajeńskiej w stanowisku Dziembowo

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Ratajczak-Szczerba M.

tom Vol. 16

107-110

The outcropin Dziembowo, located in the edge of Notec Pradolina allows to led the detailed lithofacial analysis. As a result of it two till layers were recognized, that are divided by deposits of catastrophic glaciofluvial rising. There were recognized textural, structural features and petrographic composition of glacial tills.

Geologia, stratygrafia i interpretacja genetyczna glin lodowcowych wzniesienia czołowo morenowego w Wolsku Dolnym

100%

Ratajczak-Szczerba M.

tom Vol. 16

111-114

The outcropin Wolsko Dolne is located in one of the hills ofWyrzysk Oscillacion end moraines. There were recognized four complexes of glacial and glaciofluvial deposits. Glacial tills were identified with help of detailed lithofacial analisys. There were recognized textural, structural features and petrographic composition of glacial tills

Evaluation of expansivity of Neogene clays and glacial tills from central Poland on the basis of suction tests

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Izdebska-Mucha D. , Wójcik E.

tom Vol. 59, No. 3

593--602

This paper presents the characteristics of the expansivity and quantitative prediction of heave of clay soils from Poland based on suction testing. 11 Neogene clays and 6 glacial tills, differing in genesis and plasticity, were analyzed to identify the expansive potential using eight empirical methods. The laboratory studies included measurements of soil-water characteristic curves and soil index properties. Data from water content, volume and suction measurements served to determine the suction compression index Ch and the suction-water content index Dh/Dw of the soils examined. The values of these indices are clearly dependent of the clay fraction content in tested soils. Compared with glacial tills, Neogene clays are expected to exhibit larger changes in volume due to changes in soil suction. Comparative results of the evaluation of expansivity suggest that the chosen classification methodologies provided consistent expansion ratings for glacial tills, while values for Neogene clays vary from low to very high. The lowest expansivity classes have been obtained from evaluation based on soil suction. The McKeen (1992) method has been adopted for calculations of the potential field heave of Neogene clays and glacial tills. In order to provide a rational estimation of expansive soil behavior, specialists should take into consideration the specific site and design features.

Stress-strain behaviour analysis of Middle Polish glacial tills from Warsaw (Poland) based on the interpretation of advanced field and laboratory tests

84%

Bąkowska A. , Dobak P. , Gawriuczenkow I. , Kiełbasiński K. , Szczepański T. , Trzciński J. , Wójcik E. , Zawrzykraj P.

2016

tom Vol. 66, no. 3

561--585

The selected parameters of the Wartanian and Odranian tills, with relation to their spatial occurrence, grain size distribution, mineralogical composition, matric suction and other physical characteristics, are presented. The assessment of the lithogenesis and stress history on the microstructure is attempted. The comparison of the compression and permeability characteristics from field and laboratory tests has been performed. Laboratory consolidation tests carried out with up to 20MPa vertical stress, revealed two yield stress values, one in the range of a couple hundreds kPa, the other in the range of a couple thousands kPa. Based on those results, the reliability of the soil preconsolidation assessment, with the use of the two different methods is discussed. The aspect of the triaxial strength reduction under the dynamic loading of diverse frequency and amplitude is raised. The research results depict a variety of possible geological-engineering characteristics, under the divergent constraints scenarios, of compression or strength weakening origin. The effects of the specialized research program will widen the possibilities of physio-mechanical and structural characterization of soils for geological-engineering purposes.