Temat: moduł ściśliwości - Katalog OPAC zbiorów

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Tytuł:: Charakterystyki odkształceniowe lessów południowo-wschodniej Polski
Displacement parameters of loesslike soils from southeastern Poland
Autorzy:: Frankowski, Z.
Pietrzykowski, P.
Powiązania:: https://bibliotekanauki.pl/articles/2075718.pdf
Data publikacji:: 2017
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: lessy
parametry odkształceniowe
moduł ściśliwości
loess
displacement parameters
oedometer modulus
Opis:: Basing on the experience of numerous years of research in southeastern Poland at two test areas, the paper presents results of chosen stress-strain parameters taken on loess and loesslike soils. The effects of laboratory investigations and field tests were collected into several correlations forfuture assessment of definitely important displacement parameters scrutinizing for civil engineering purposes on these problematic soils. Geotechnical investigations reporting and research experience shows that fine-grained loesslike sediments are taken as tricky soils because ofgeotechnical parameters located often between non-cohesive soils with dominating sand fraction and cohesive soils where clays dictate the soils’ behavior.
Źródło:: Przegląd Geologiczny; 2017, 65, 10/2; 832--839
0033-2151
Pojawia się w:: Przegląd Geologiczny
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Charakterystyka zmian deformacyjnych gruntów antropogenicznych z osadników cukrowni
Characterization of deformation changes in anthropogenic soil from the wet dumps of sugar factories
Autorzy:: Choma-Moryl, K.
Powiązania:: https://bibliotekanauki.pl/articles/2074825.pdf
Data publikacji:: 2010
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: grunty antropogeniczne
osadniki
moduł ściśliwości pierwotnej
odkształcenie pęcznienia
skurcz liniowy
anthropogenic soils
wet dumps
swelling strain
shrinkage limit
Opis:: Sewer sludge that fills four wet dumps of the closed Małoszyn Sugar Factory in Malczyce near Środa Śląska, Lower Silesia constitutes a very specific anthropogenic soil. It is composed of grains and mineral particles transported in suspension after sugar beets pre-processing treatment. Presently the wet dumps are to be recultivated to meet the requirements of environmental protection. According to the recultivation project the wet dumps will be backfilled with suitable waste material and covered with sand and soil to stimulate soil forming processes. Finally grass, clover and shrubs will be introduced. The recultivation layer thickness will reach 3-6 m. Anthropogenic soil that fills the wet dumps is up to 2-3 m thick. The grain-size distribution is generally consistent with silty loam, silty clay loam and silty clay. Quartz, illite and chlorite dominate the mineral composition. The wet dump's bottom is formed by clays of the Poznań Formation, practically impermeable. Silt-dominated soils deposited in a water environment are highly susceptible to deformations caused by water and overload. Deformation behaviour was studied for the soil in a semi-solid state as well as in a soft-plastic state. Varying influence of water results, among others, in shrinkage (Ls) and swelling of the soils, characterized in the present study by swelling strain (p). Load-induced deformation of the soils is described basing on the modulus of primary compressibility. Basing on the results obtained it may be stated that the investigated anthropogenic soil undergoes moderate deformations under the influence of water. The swelling strain does not exceed 0.5-1.2% for the soil in a soft-plastic state and amount to 3.1-4.3% in a semi-solid state. The soil shrinkage limit varies between 3 and 5%. On the other hand load-induced deformations will be of remarkably higher importance. The soil in a soft-plastic state shows high shrinkage that is comparable with the one for organic soils. The modulus of primary compressibility is 282.3-925.9 kPa. The compressibility is markedly lower for a semi-solid state (MO =1 190.5-2 000 kPa). Characteristically, in both soft-plastic and semi-solid states the soil shows higher compressibility for lower load values 0-50 kPa than for the higher range 0-200 kPa. These compressibility values should be taken into account during backfilling of the wet dumps with various safe waste materials at recultivation. The load-induced pressure, initially low, will increase with adding consecutive layers. Thus highest soil deformations should be expected during the initial backfilling stages and their intensity may be estimated using the modulus of primary compressibility.
Źródło:: Przegląd Geologiczny; 2010, 58, 9/2; 892-897
0033-2151
Pojawia się w:: Przegląd Geologiczny
Dostawca treści:: Biblioteka Nauki

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