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Determination of effective parameters of Biot model with the Kelvin–Voight rheological skeleton

Bartlewska-Urban M., Strzelecki T., Urban R.

Archives of Civil and Mechanical Engineering

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2015

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Vol. 15, no. 4

1173--1179

EN

This paper presents results of laboratory tests aiming in estimation of the effective parameters of the Biot model with the rheological skeleton for the samples collected at the flotation waste landfill “Żelazny Most”. In order to determine the effective parameters series of tests were performed in the laboratory of the Faculty of Civil Engineering at the National University of Ireland in Galway. Estimation of model parameters was performed with the use of optimization. It consists on searching the parameter space for the optimal set of values, in terms of the least square errors between the results of experiments and the results of calculations with the model. This paper presents the results of experiments on samples specially prepared for the experiment. More detailed picture of the results obtained is presented in a doctoral thesis “Determination of effective parameters of rheological models of cohesive soils” [1].

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Effect of variation of temperature field on the process of thermal consolidation of tailings pond “Żelazny Most”

Bartlewska-Urban M., Strzelecki T.

Studia Geotechnica et Mechanica

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2014

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Vol. 36, nr 2

57--65

EN

The following study presents numerical calculations for establishing an impact of temperature changes on the process of distortion of bi-phase medium. The Biot consolidation equations with Kelvin–Voigt rheological skeleton were used for that purpose. The process was exemplified by thermal consolidation of post floatation dump “Żelazny Most”. We analyzed the behavior of the landfill under the action of its own weight, forces of floating filtration and temperature gradient. Values of certain effective parameters of model were obtained during laboratory tests on material obtained from the landfill. The remaining data for mediums with similar characteristics were taken from literature. The results obtained from the stress state in the landfill allow the magnitude of plasticity potential to be specified based on known strength criteria. Change in the value sign of the plasticity potential clearly testifies to the emergence of an area of plasticity of material from landfill, however, this does not indicate the loss of stability of this hydrotechnical structure.

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Numerical calculations of the consolidation of flotation waste landfill 'Żelazny Most' based on Biots model with the Kelvin-Voight rheological skeleton

Strzelecki T., Bartlewska-Urban M.

Archives of Civil Engineering

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2011

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Vol. 57, nr 2

199-213

EN

This paper presents simulation results of the consolidation process of the flotation waste landfill "Zelazny Most". The mathematical model used in presented research is based on Biot's model of consolidation and is extended with rheological skeleton. The load is the mass pressure of the landfill itself. The initial point selected for calculations was based on the ground water level calculated in a landfill. The creeping process in this waste landfill was analyzed along the north-south section. The solution is therefore 2D with the assumption of a plane strain state. Effective model parameters data were obtained in laboratory tests on the material from the waste landfill. Results obtained for a stress state in a storage state can help to determine whether the adopted linear model of visco-elastic medium does not lead to changes in the Coulomb-Mohr potential yield, showing the emergence of plasticity of material storage areas.

PL

W pracy przedstawiono wyniki symulacji procesu konsolidacji składowiska odpadów poflotacyjnych Żelazny Most w oparciu o model matematyczny konsolidacji Biota ze szkieletem reologicznym pod działaniem ciężaru własnego składowiska. Punktem wyjścia do obliczeń było obliczone zwierciadło wód podziemnych w składowisku. Zagadnienie pełzania składowiska wykonano w przekroju północ-południe przez składowisko. Rozwiązanie jest więc typu 2D przy założeniu płaskiego stanu odkształcenia. Dane dotyczące parametrów efektywnych modelu uzyskano w badaniach laboratoryjnych na materiale uzyskanym na składowisku. Uzyskane wyniki stanu naprężenia w składowisku pozwalają określić, czy przyjęty liniowy model ośrodka lepko sprężystego nie prowadzi do pojawienia się zmian znaku wartości potencjału plastyczności Coulomba-Mohra, co świadczyłoby o pojawianiu się obszarów uplastycznienia materiału składowiska.