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11 results on '"Warchala, Ewa"'

1. Impact of ICT Infrastructure on the Processing of Large Raster Datasets

Author

Kosydor, Paweł, Warchala, Ewa, Piórkowski, Adam, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Choraś, Michał, editor, and Choraś, Ryszard S., editor

Published
2020
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2. Identifying Factors Influencing Surface Deformations from Underground Mining Using SAR Data, Machine Learning, and the SHAP Method.

Author

Cieślik, Konrad, Milczarek, Wojciech, Warchala, Ewa, Kosydor, Paweł, and Rożek, Robert

Subjects
MINES & mineral resources, MINE subsidences, MINE closures, COPPER mining, COPPER ores, MACHINE learning
Abstract

The article presents the results of significance analyses of selected mining and geological variables for an area of underground mining activity. The study area was a region of an underground copper ore mine located in southwest Poland. The input data consisted of satellite radar data from the Sentinel 1 mission as well as mining and geological data. The line-of-sight subsidence, calculated with the use of the small baseline subset method and arranged in time series, was decomposed to extract the vertical component. The significance analysis of individual variables for the observed surface subsidence was performed using the SHapley Additive exPlanations method for the XGBoost machine learning model. The results of the analysis showed that the observed ground surface subsidence velocities were most influenced by the thickness of the PZ3 layer, which is located approximately 200 m above the roof of the mined seam, the thickness of the seam, and the timing of mining. It was also found that the proposed model was able to detect a nonlinear relationship between the analyzed excavations. The most significant influence on ground subsidence over mine excavations are mining parameters such as the spatially averaged thickness of the deposit and the time since liquidation of the deposit. The proposed approach can be successfully employed in planning both mining operations and mine closure in such a manner that the environmental impact is minimized. [ABSTRACT FROM AUTHOR]

Published
2024
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5. Geophysical Research of Secondary Deformations in the Post Mining Area of the Glaciotectonic Muskau Arch Geopark—Preliminary Results

Author

Blachowski, Jan, primary, Warchala, Ewa, additional, Koźma, Jacek, additional, Buczyńska, Anna, additional, Bugajska, Natalia, additional, Becker, Miłosz, additional, Janicki, Dominik, additional, Kujawa, Paulina, additional, Kwaśny, Leszek, additional, Wajs, Jaroslaw, additional, Targosz, Paweł, additional, and Wojdyła, Marek, additional

Published
2022
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6. Transformation processes in lignite post-mining landscape - erosion of anthropogenic formations in the former “Przyjazn Narodow – Szyb Babina” mine (Poland)

Author

Blachowski, Jan, Becker, Miłosz, Kujawa, Paulina, Koźma, Jacek, Warchala, Ewa, Dynowski, Aleksandra, Pawlik, Marcin, Wajs, Jarosław, and Buczyńska, Anna

Abstract

Der Abbau von Mineralien wirkt sich auf alle Komponenten des Ökosystems aus, und die Umwelt nach dem Bergbau sollte kontinuierlich überwacht werden, um die Qualität und Effizienz der Rekultivierungsverfahren zu kontrollieren. In der Vergangenheit wurden die Nachbergbaugebiete oft nicht vollständig rekultiviert und nicht überwacht. Ziel der Studie war die Analyse der Oberflächenerosion (Grabenerosion) in einem stillgelegten nachbergbaulichen Braunkohlegebiet im heutigen grenzüberschreitenden deutsch-polnischen Geopark Muskauer Faltenbogen. Zu diesem Zweck wurde kostengünstige UAV-Photogrammetrie zur Erfassung der Oberflächenbeschaffenheit teilweise sanierter Haldenflächen und anschließend ein Digitales Höhenmodell (DHM) Differenzverfahren zur quantitativen Analyse von Höhenveränderungen eingesetzt. Die Ergebnisse der Auswertung von Daten aus vier UAV-Missionen, die zwischen Frühjahr 2020 und Herbst 2021 (18 Monate) durchgeführt wurden, ermöglichten die Bestimmung von Höhenmodellen mit hoher Genauigkeit (±0,02 – ±0,04 m) und die Entwicklung von differenziellen Höhenmodellen zur Abschätzung von Materialbewegungen und Oberflächenveränderungen in drei ausgewählten Schluchten. Alle untersuchten Standorte sind einer Oberflächenerosion ausgesetzt, die wahrscheinlich auf die Auswirkungen von Regenfällen zurückzuführen ist, die eine natürliche Landschaftsgestaltung des Gebiets bewirken. Die größten registrierten Höhenänderungen in Verbindung mit Materialverlusten in den Untersuchungsquerschnitten erreichen 0,9 m. Die UAV-gestützte Datenberechnung des Differenz-DEM hat sich als zeiteffiziente und genaue Methode zur Analyse von Höhenänderungen in Nachbergbaugebieten erwiesen, die für Oberflächenerosion anfällig sind. Um optimale Ergebnisse zu erzielen, wird empfohlen, UAV-Missionen zu planen, wenn die Sonne am höchsten steht und an bewölkten Tagen, um die Auswirkungen des Sonnenschattens auf die Qualität der erzeugten DHMs zu minimieren. Weitere Studien sind geplant, um Materialbewegungen mit Niederschlagsaufzeichnungen in Beziehung zu setzen.

Published
2023
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10. Integrated analysis of rock mass deformation within shaft protective pillar

Author

Warchala, Ewa and Szostak-Chrzanowski, Anna

Subjects
lcsh:TN1-997, shaft, lcsh:Engineering geology. Rock mechanics. Soil mechanics. Underground construction, rock mass deformation, lcsh:TA703-712, protective pillar, rock mass stress, rock mass deformation, shaft, protective pillar, lcsh:Mining engineering. Metallurgy, rock mass stress
Abstract

The paper presents an analysis of the rock mass deformation resulting from mining in the vicinity of the shaft protection pillar. A methodology of deformation prediction is based on a deterministic method using Finite Element Method (FEM). The FEM solution is based on the knowledge of the geomechanical properties of the various geological formations, tectonic faults, types of mining systems, and the complexity of the behaviour of the rock mass. The analysis gave the stress and displacement fields in the rock mass. Results of the analysis will allow for design of an optimal mining system. The analysis is illustrated by an example of the shaft R-VIII Rudna Mine KGHM Polish Copper SA.

Published
2016

11. INTEGRATED ANALYSIS OF ROCK MASS DEFORMATION WITHIN SHAFT PROTECTIVE PILLAR.

Author

WARCHALA, Ewa and SZOSTAK-CHRZANOWSKI, Anna

Subjects
SHAFTS (Excavations), FINITE element method, ROCK deformation, GEOLOGY, MINES & mineral resources
Abstract

The paper presents an analysis of the rock mass deformation resulting from mining in the vicinity of the shaft protection pillar. A methodology of deformation prediction is based on a deterministic method using Finite Element Method (FEM). The FEM solution is based on the knowledge of the geomechanical properties of the various geological formations, tectonic faults, types of mining systems, and the complexity of the behaviour of the rock mass. The analysis gave the stress and displacement fields in the rock mass. Results of the analysis will allow for design of an optimal mining system. The analysis is illustrated by an example of the shaft R-VIII Rudna Mine KGHM Polish Copper SA. [ABSTRACT FROM AUTHOR]

Published
2015
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