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Analysis of the Geomechanical Phenomena That Led to the Appearance of Sinkholes at the Lupeni Mine, Romania, in the Conditions of Thick Coal Seams Mining with Longwall Top Coal Caving

Author

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  • Dacian-Paul Marian

    (Department of Mining Engineering, Mining Surveying and Constructions, University of Petroșani, 332006 Petroșani, Romania)

  • Ilie Onica

    (Department of Mining Engineering, Mining Surveying and Constructions, University of Petroșani, 332006 Petroșani, Romania)

Abstract

Thick coal seam no. 3, block V, Lupeni mine was mined by longwall top coal caving (LTCC). After the coal mining, the ground surface underwent continuous subsidence, but since 2008, three sinkholes have appeared on the surface with important dimensions, atypical for the geo-mining conditions in this coal basin. This article is a synthesis of the study meant to decipher the geo-mechanical phenomenon that led to the emergence of these sinkholes and highlighting the main factors that contributed to the development of this phenomenon. For this purpose, measurements were made on the terrain deformations using photogrammetric methods and aerial laser scanning, when modeling with 3D finite elements, in elasto-plasticity and with the help of the Knothe–Budrik influence function. The factors that contributed to the occurrence of discontinuous subsidence phenomena are shallow mining depth, the LTCC mining method, and the presence of faults in the vicinity of the mining panels. Additionally, the geo-mechanical phenomena of subsidence terrace development and sinkholes in the mining subsidence troughs at the Lupeni mine were described.

Suggested Citation

  • Dacian-Paul Marian & Ilie Onica, 2021. "Analysis of the Geomechanical Phenomena That Led to the Appearance of Sinkholes at the Lupeni Mine, Romania, in the Conditions of Thick Coal Seams Mining with Longwall Top Coal Caving," Sustainability, MDPI, vol. 13(11), pages 1-27, June.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:11:p:6449-:d:569726
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    References listed on IDEAS

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    1. Dacian Paul Marian & Ilie Onica & Ramona-Rafila Marian & Dacian-Andrei Floarea, 2020. "Finite Element Analysis of the State of Stresses on the Structures of Buildings Influenced by Underground Mining of Hard Coal Seams in the Jiu Valley Basin (Romania)," Sustainability, MDPI, vol. 12(4), pages 1-25, February.
    2. Yubing Gao & Dongqiao Liu & Xingyu Zhang & Manchao He, 2017. "Analysis and Optimization of Entry Stability in Underground Longwall Mining," Sustainability, MDPI, vol. 9(11), pages 1-19, November.
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    1. Chunyi Li & Laizhong Ding & Ximin Cui & Yuling Zhao & Yihang He & Wenzhi Zhang & Zhihui Bai, 2022. "Calculation Model for Progressive Residual Surface Subsidence above Mined-Out Areas Based on Logistic Time Function," Energies, MDPI, vol. 15(14), pages 1-20, July.
    2. Jian Hao & Anfa Chen & Xuelong Li & Hua Bian & Guanghua Zhou & Zhenguo Wu & Linjun Peng & Jianquan Tang, 2022. "Analysis of Surrounding Rock Control Technology and Its Application on a Dynamic Pressure Roadway in a Thick Coal Seam," Energies, MDPI, vol. 15(23), pages 1-23, November.

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