Browsing by Subject "compaction"

Now showing 1 - 5 of 5

Access status: Open Access ,
A novel approach to quantifying the effect of the density of sand cores on their gas permeability
(AGH University Press, 2022) Sundaram, Dinesh; Svidró, József Tamás; Svidró, Judit; Diószegi, Attila
The density of moulding mixtures used in the foundry industry plays a significant role since it influences the strength, porosity, and permeability of moulds and cores. The latter is routinely tested in foundries using different solutions to control the properties of the moulding materials that are used to make moulds and cores. In this paper, the gas permeability of sand samples was measured using a custom-made setup to obtain the gas permeability in standard units instead of the usual permeability numbers (PN) with calibrated units. The aim of the work was to explore the effect of density variations in moulding materials on their gas permeabilities. Permeability in this work is quantified in SI units, square metres [m$^{2}$]. The setup works based on Darcy's law and the numbers obtained from the measurements can be used to deduce the gas permeability, $k$, of a sample. Two furan resin bonded mixtures with the same grain size distribution were hand-rammed with varying compaction forces to obtain a variation in density. Cylindrical samples (50 × 50 mm) were prepared using a silica sand aggregate sourced from a Swedish lake. The results of the measurement provided the difference in gas permeability between the samples that have varying densities. The results of permeability were then extrapolated by modifying the viscosity value of the air passed through the sample. In order to find the effect of apparent density variation on the pore characteristics of the samples, mercury intrusion porosimetry (MIP) was also performed. The results were in line with the gas permeability measurements.
Access status: Open Access ,
Complex analysis of GPR signals for the delineation of subsurface subtle features
(Wydawnictwa AGH, 2019) Akinsunmade, Akinniyi; Tomecka-Suchoń, Sylwia; Pysz, Paweł
In this paper, complex signal analyses of ground penetrating radar (GPR) field data over an area of farmland in Krakow were interpreted alongside the basic filtered field data. The farmland was simulated with varying degrees of soil compaction induced by tractor movement. The focus of the study was the delineation of inherent characteristics of media through which the electromagnetic energy travelled. Fourteen GPR profiles were acquired from the area. The field data were subjected to pre- and post-processing prior to its the presentation and interpretation. Advance analysis operations on the field data which resorted in different attributes reveal more about the effects of the compaction on the soil than indicated by the basic filtered field data. Better resolution of subsurface layers boundary and lateral variation in the physical properties of the traversing media were well elucidated. The results have demonstrated that an advanced signal processing such as used in the study has ability to depict subtle characteristics of the propagating media.
Access status: Restricted ,
Metody wzmacniania podłoża obiektów inżynierskich
(Data obrony: 2017-01-26) Krzyżewska, Kamila
Wydział Geologii, Geofizyki i Ochrony Środowiska
Metody wzmacniania podłoża obiektów inżynierskich można podzielić na dwie kategorie: wzmacnianie gruntu rodzimego i metody wykorzystujące dodatkowe materiały. Grunt rodzimy może być wzmacniany poprzez zagęszczanie statyczne, dynamiczne, lub prekonsolidację. Do metod wzmacniania z wykorzystaniem dodatkowych materiałów zaliczamy cementację i stabilizację, zbrojenie masywu gruntowego i wymianę gruntu. Ulepszenia podłoża wykonuje się w celu zmniejszenia osiadań, wodoprzepuszczalności, zredukowania szkodliwych zjawisk, a także zwiększenia nośności i odporności na obciążenia.
Access status: Restricted ,
Modelowania parametrów zbiornikowych utworów czerwonego spągowca w głębszej strefie basenu permskiego
(Data obrony: 2012-10-16) Brzuszek, Paweł
Wydział Geologii, Geofizyki i Ochrony Środowiska
Author has analyzed the main factors which influenced porosity development in Rotliegend formations for estimating this parameter in the undrilled area of the central part of the basin. Porosity – depth trends dependent on the facial distribution were proposed. 1D modelling of mechanical compaction and quartz cementation processes were conducted for three wells situated in the central part of the basin: Września IG-1, Piła IG-1, Czaplinek IG-1. The Walderhaug model was used to simulate quartz cementation. Theoretical basics of diagenetic processes simulation during basin modelling were also described.
Access status: Open Access ,
O kompakcji utworów geologicznych
(2008) Twardowski, Kazimierz; Traple, Jacek
The papers tackles the problems of compaction of geologic formations. The most important notions referring to mechanical (geometric) compaction and chemical (mineral) compaction have been discussed. The most relevant regularities in sandy and clayey beds have been characterized. A mathematical model describing irreversible changes in porosity with depth has been analyzed for sedimentary rocks. A good congruence of modelling and empirical data prove that the model can be treated as a universal mechanical rocks compaction model.