Numerical Investigation of the Slope Stability in the Waste Dumps of Romanian Lignite Open-Pit Mines Using the Shear Strength Reduction Method

Open-pit mining generates significant amounts of waste material, leading to the formation of large waste dumps that pose environmental risks such as land degradation and potential slope failures. The paper presents a stability analysis of waste dump slopes in open-pit mining, focusing on the Motru c...

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Bibliographic Details
Published inApplied sciences Vol. 14; no. 21; p. 9875
Main Authors Popescu, Florin Dumitru, Andras, Andrei, Radu, Sorin Mihai, Brinas, Ildiko, Iladie, Corina-Maria
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.11.2024
Subjects
Anniversaries
Comsol
Environmental impact
factor of safety (FoS)
Failure
Friction
Investigations
Lignite
Methods
mine waste dump
Mineral industry
Mines and mineral resources
Mining
Mining industry
Numerical analysis
Refuse and refuse disposal
Shear strength
shear strength reduction method
slope stability
Software
United States
Romania
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Summary:Open-pit mining generates significant amounts of waste material, leading to the formation of large waste dumps that pose environmental risks such as land degradation and potential slope failures. The paper presents a stability analysis of waste dump slopes in open-pit mining, focusing on the Motru coalfield in Romania. To assess the stability of these dumps, the study employs the Shear Strength Reduction Method (SSRM) implemented in the COMSOL Multiphysics version 6 software, considering both associative and non-associative plasticity models. (1) Various slope angles were analyzed, and the Factor of Safety (FoS) was calculated, showing that the FoS decreases as the slope angle increases. (2) The study also demonstrates that the use of non-associative plasticity leads to lower FoS values compared to associative plasticity. (3) The results are visualized through 2D and 3D models, highlighting failure surfaces and displacement patterns, which offer insight into the rock mass behavior prior to failure. (4) The research also emphasizes the effectiveness of numerical modeling in geotechnical assessments of stability. (5) The results suggest that a non-associative flow rule should be adopted for slope stability analysis. (7) Quantitative results are obtained, with small variations compared to those obtained by LEM. (6) Dilatation angle, soil moduli, or domain changes cause differences of just a few percent and are not critical for the use of the SSRM in engineering.
ISSN:2076-3417
2076-3417
DOI:10.3390/app14219875