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Slope stability estimation of the Kościuszko Mound in Cracow

Wrana B., Pietrzak N.

Studia Geotechnica et Mechanica

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2015

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Vol. 37, nr 2

93--101

EN

In the paper, the slope stability problem of the Kościuszko Mound in Cracow, Poland is considered. The slope stability analysis was performed using Plaxis FEM program. The outer surface of the mound has complex geometry. The slope of the cone is not uniform in all directions, on the surface of the cone are pedestrian paths. Due to its complicated geometry it was impossible to do computing by Plaxis input pre-procesor. The initial element mesh was generated using Autodesk Autocad 3D and next it was updated by Plaxis program. The soil parameters were adopted in accordance with the detailed geological soil testing performed in 2012. Calculating model includes geogrids. The upper part was covered by MacMat geogrid, while the lower part of the Mound was reinforced using Terramesh Matt geogrid. The slope analysis was performed by successives reduction of φ /c parameters. The total multiplayer ΣMsf is used to define the value of the soil strength parameters. The article presents the results of slope stability before and after the rainfall during 33 days of precipitation in flood of 2010.

2

Influence of inertia forces on soil settlement under harmonic loading

Wrana B., Pietrzak N.

Studia Geotechnica et Mechanica

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2013

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Vol. 35, nr 1

245--258

EN

The paper deals with the comparison of Biot’s model for saturated, porous soils with other simplified models used in dynamic analysis. The purpose of this paper is to determine some limits of validity of the various models. In order to do this a full set of governing, dynamic equations of Biot model and a series of simplifying models such as u-p simplification and quasi-static consolidation models are considered. These formulations are applied to a simple soil layer under periodic surface loading. A displacement of skeleton and a displacement of fluid are shown and compared with each model for various formulations.

3

Wstępna technologia wytwarzania gum z modyfikowanym montmorylonitem

Oczkowski M., Jurkowski B., Pietrzak N.

Archiwum Technologii Maszyn i Automatyzacji

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2005

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Vol. 25, nr 1

219-227

PL

W artykule przedstawiono właściwości mechaniczne gum wykonanych z trzech różnych mieszanek gumowych. Mieszanki te napełniono modyfikowanym i niemodyfikowanym montmorylo-nitem. Modyfikacja montmorylonitu miała na celu zmianę jego właściwości hydrofilowych na hydrofobowe, co poprawia jego adhezję do polimeru. Skuteczność modyfikacji zweryfikowano, przeprowadzając analizę widm w podczerwieni oraz wypalając części organiczne. Przebadano wpływ stopnia napełnienia na właściwości wulkanizatów. Wykonano badania wytrzymałości statycznej, elastyczności i twardości. Pomiary prowadzono także na próbkach poddanych przyspieszonemu starzeniu. Z badań wynika, że dodanie 5 phr modyfikowanego montmorylonitu poprawia właściwości użytkowe gumy. Widoczne są znaczące różnice pomiędzy gumami napełnionymi modyfikowanym i niemodyfikowanym montmorylonitem.

EN

There have been investigated some mechanical properties of cured rubber made of natura! rubber (SMR 20), butadiene-styrene rubber (KER 1500), and compound (60/40) of butadiene-styrene and butadiene cis-1 A rubber (SKD type 2). Compounds were filled of neat (MMT) and modified (oMMT) montmorillonite. Elastics modulus, hardness, and Schob elasticity of cured rubber before and after aging was examined. Also, an influence of MMT concentration on rubber properties was examined. Organo-modified MMT was added in concentrations of 5 and 10 phr. Compounds without any filler and with 10 phr of unmodified MMT was made for comparison. There is a significant difference between behavior of rubbers containing modified and unmodified montmorillonite.