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Content available Optimization of technological measures increasing the safety of the Żelazny Most tailings pond dams with the combined use of monitoring results and advanced computational models
Łydżba Dariusz, Różański Adrian, Sobótka Maciej, Stefanek Paweł
Archives of Civil Engineering
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2022
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Vol. 68, nr 1
503--518
EN
The paper presents the approach for optimization of preventive/technological measures increasing the safety of tailings pond dams. It is based on the combined use of monitoring results as well as advanced 3D finite element (FE) modeling. Under consideration was the eastern dam of Żelazny Most Tailings Storage Facility (TSF). As part of the work, four numerical models of the dam and the subsoil, differing in the spatial arrangement of the soil layers, were created. For this purpose, the kriging technique was used. The numerical models were calibrated against the measurements from the monitoring system. In particular the readings acquired from benchmarks, piezometers and inclinometers were used. The optimization of preventive measures was performed for the model that showed the best general fit to the monitoring data. The spatial distribution and installation time of relief wells were both optimized. It was shown that the optimized system of relief wells provides the required safety margin.
PL
W artykule przedstawiono podejście do optymalizacji zabiegów technologicznych zwiększających bezpieczeństwo zapór zbiorników odpadów wydobywczych. Opiera się ono na jednoczesnym wykorzystaniu wyników monitorowania oraz modelowania numerycznego 3D w ujęciu metody elementów skończonych. Rozpatrywana jest wschodnia zapora OUOW Żelazny Most. W ramach pracy stworzono cztery modele numeryczne zapory i podłoża, różniace się przestrzennym układem warstw gruntowych. W tym celu wykorzystano technikę krigingu. Na podstawie wyników monitoringu skalibrowano modele numeryczne i wybrano ten, dla którego przeprowadzono procedurę optymalizacji. Zoptymalizowano zarówno rozkład przestrzenny, jak i czas instalacji studni odciążających. Wykazano, że takie rozwiązanie zapewnia, wymagany stosownymi rozporządzeniami, zapas bezpieczeństwa.
2
Content available Safety analysis of the Żelazny Most tailings pond: qualitative evaluation of the preventive measures effectiveness
Łydżba Dariusz, Różański Adrian, Sobótka Maciej, Pachnicz Michał, Grosel Szczepan, Tankiewicz Matylda, Stefanek Paweł
Studia Geotechnica et Mechanica
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2021
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Vol. 43, nr 2
181--194
EN
In this paper, a qualitative safety analysis of the Żelazny Most tailings pond is addressed. This object is one of the largest facilities of this type in the world being a crucial element in the technological line of copper production in KGHM Polska Miedź S.A. The assessment of the effectiveness of two types of preventive measures, i.e., relief wells and loading berms, is investigated based on displacement and stability analysis of two 2D cross-sections in a technical section of the dam. The study shows that the considered preventive measures generally have a positive impact on increasing the safety level of the structure during its further raise. In particular, their effectiveness is most evident when they are applied simultaneously. It is eventually suggested that the selection of final solutions to be applied on the facility should be based on the quantitative 3D analysis.
3
Content available A comprehensive approach to the optimization of design solutions for dry anti-flood reservoir dams
Łydżba Dariusz, Różański Adrian, Sobótka Maciej, Pachnicz Michał, Grosel Szczepan, Rainer Jakub
Studia Geotechnica et Mechanica
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2021
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Vol. 43, nr 3
270--284
EN
The article proposes the methodology of designing dams of dry flood control reservoirs. The algorithm is developed so as to meet all the requirements given in the Eurocode 7 and, at the same time, to be efficient in terms of necessary calculation time. Furthermore, the presented numerical procedure enables the optimization of design solutions, e.g. the depth and length of the anti-filtration barrier, by means of parametric analyses. The approach assumes the use of numerical methods, in particular, finite element (FE) analysis. Three-dimensional (3D) reconstruction of the terrain topography and subsoil layer arrangement performed in step (1) sets the base for further analyses. In step (2), the filtration phenomena are assessed based on the 3D analysis of a transient groundwater flow. In step (3), the state of displacement is evaluated and the stability is verified for all the relevant phases of construction and operation of the facility, in particular, in the course of simulated flood detention. The analyses in step (3) are carried out on 2D models corresponding to the design cross-sections of the dam. This significantly reduces the computation time (compared to 3D analysis) and, at the same time, provides a safe estimate of factor of safety. The performance of the proposed algorithm is shown on the numerical examples of the computations concerning the dam of Szalejów Górny dry anti-flood reservoir located in Poland.
4
Content available remote Tunele kolejowe. Rewitalizacja, ocena stanu technicznego, projekt naprawczy, modelowanie numeryczne : problemy naukowo-techniczne
Łydżba Dariusz, Dróżdż Arkadiusz, Wątroba Paweł, Różański Adrian, Sobótka Maciej, Pachnicz Michał, Grosel Szczepan, Rainer Jakub
Geoinżynieria : drogi, mosty, tunele
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2021
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nr 2
92--102
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