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Bulletin of Engineering Geology and the Environment

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01.08.2024 | Original Paper

Numerical analysis of fissure development and self-healing mechanism on surface due to longwall mining

verfasst von: Na Zhang, Yuxin Ren, Yingming Yang, Pingye Guo

Erschienen in: Bulletin of Engineering Geology and the Environment | Ausgabe 8/2024

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Abstract

The causes of ground fissure formation are closely related to the change in the stress state in a loose layer, but many researchers often ignore the dynamic processes of mining when studying mining-induced damage mechanisms. The study of stress evolution in a loose layer during mining can help to reveal the causes of surface damage and its self-healing mechanism. This paper establishes a numerical model to study a loose layer’s stress evolution and its causes during mining. The discriminative conditions of the potential dynamic fissure formation cycles and self-healing are given. The vertical and horizontal stresses in the loose layer at the mining boundary increase and then decrease under the mining disturbance, and the vertical stresses in the loose layer above the comprehensive mining surface undergo two increasing and decreasing stages, while the horizontal stresses increase and decrease and then increase again. The permanent fissures at the mining boundary form because of the decompression- and compression-related damage caused by horizontal unloading, while the dynamic fissures in the loose layer at the mining surface form due to the first horizontal unloading effect; the shear damage is caused by the second increase in vertical stress. Additionally, the soil Mohr‒Coulomb strength criterion and the linear elastic stress‒strain relationship are used to discriminate the single- and double-cycle development patterns of the dynamic fissures on the ground surface.

Vorheriger Artikel Slide-controlling modes and classification system of the mélange high slopes: insight into a disaster-causing mechanism of the Jinsha River mélange belt in the eastern Tibetan Plateau

Nächster Artikel Mechanism of surface subsidence and sinkhole formation in mining areas: insights from MPM

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Titel: Numerical analysis of fissure development and self-healing mechanism on surface due to longwall mining
verfasst von: Na Zhang
Yuxin Ren
Yingming Yang
Pingye Guo
Publikationsdatum: 01.08.2024
Verlag: Springer Berlin Heidelberg
Erschienen in: Bulletin of Engineering Geology and the Environment / Ausgabe 8/2024
Print ISSN: 1435-9529
Elektronische ISSN: 1435-9537
DOI: https://doi.org/10.1007/s10064-024-03829-0

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