Browsing by Subject "compressibility"

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Access status: Open Access ,
Charakterystyka zmian ściśliwości roztworów soli NaCl pod wpływem wysokich ciśnień hydrostatycznych
(Wydawnictwa AGH, 2009) Koszela-Marek, Ewa
The paper presents results of changes in compressibility of water and salt NaCl solutions of concentrations 5, 10, 20 $g/dm^{3}$ under high hydrostatic pressure from 50 up to 400 MPa in 21 degrees of Celsius. Special apparatus was used by compressibility researches - the high-pressure research position. Compressibility for NaCl water solutions evolved non-linearly. A clear relation appeared between changes in the volume of NaCl solutions, and the size of operating pressure. Reaction is also visible between compressibility and the size of concentration of the researched solution. The biggest change in volume (8.96%) appeared by the solution with the smallest concentration (5 $g/dm^{3}$), under the biggest pressure (400 MPa). The smallest change in volume (1.62%) was noted for solution with the biggest concentration (20 $g/dm^{3}$), under the smallest pressure (50 MPa).
Access status: Open Access ,
O ściśliwości gruntów prekonsolidowanych
(Wydawnictwa AGH, 2008) Suchnicka, Hanna
Three cohesive soils (clays) that were found to occur in the area of decompression resulting from the construction of a deep opencast were tested for compressibility. The tests involved three cycles: 1. soil specimens of a natural moisture content were made subject to loading, 2. the specimens were subjected to unloading and examined for swelling, 3. once again were the specimens made subject to loading. Measurements were conducted using oedometers of standard dimensions, corrections being made for self-deformations of the apparatus, over the loading range of 0-450 kPa. The results have revealed that the deformability of the soils depended on the unloading method applied, which influenced the value of the preconsolidation pressure as well.
Access status: Open Access ,
Weryfikacja zmian ściśliwości wody i roztworu soli NaCl pod wpływem wysokich ciśnień
(2008) Koszela, Józef; Koszela-Marek, Ewa; Sysak, Zdzisław
Paper presents results of water and salt NaCl (20 g/$dm^{3}$) solution compressibility under hydrostatic pressure from 50 up to 400 MPa, with 21degrees of Celsius temperature conditions. In the presented range of pressures water decreased in volume from 2,1 to 9,4%, NaCl solution from 1,6 to 6,9%. Coefficients of compressibility Beta are unequal and nonlinear. Examinations have been made in especially designed equipment.
Access status: Open Access ,
Zastosowanie równań wskaźnika ściśliwości Cc do oceny ściśliwości iłów serii poznańskiej
(Wydawnictwa AGH, 2011) Stróżyk, Joanna
Compressibility index $C_{c}$ next to the swelling index $C_{s}$ and oedometric modulus Eoed is the basic parameter characterizing the soil compressibility. This parameter is widely used in the prediction of ground settlement. In the case of fine-grained soil, determination of $C_{c}$ in laboratory test is time-consuming and expensive. For this reason, the correlation between $C_{c}$ and basic value of geotechnical parameters of soils, are searched. The most widely known equation used for determination of $C_{c}$ for clay is Skempton's equation, allowing to determine the index value on the basis of liquid limit $w_{L}$. The analysis showed that this equation can not apply in the case of a overconsolidated Poznan clays. It was found that the better the correlation is obtained by making the value of the index $C_{c}$ from the initial soil porosity $e_{0}$.