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Bulletin of Engineering Geology and the Environment
Erschienen in: Bulletin of Engineering Geology and the Environment 8/2023

01.08.2023 | Original Paper

Effect of the roof cutting technique on the overlying geotechnical structure in coal mining

verfasst von: Jianning Liu, Manchao He, Jiong Wang, Alfonso Rodríguez Dono, Can Ming, Shan Guo, Peng Liu

Erschienen in: Bulletin of Engineering Geology and the Environment | Ausgabe 8/2023

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Abstract

The first industrial trial of double-sided roof cutting with gob-side entry (N00 method) was used as the engineering background to study the effect of the roof cutting technique (RCT) in coal mining in terms of the extent of damage to the overlying geotechnical structure (OGS). A theoretical analysis model of the OGS was built for each method considered: the RCT (N00 method) results in more damage to the collapse zone than the traditional longwall mining method (121 method). Simulation models of these two methods were created in PFC2D to analyze the force chain distribution, fracture development, fragment evolution, and displacement variation patterns in the OGS. The RCT causes more collapse zone damage and less fracture zone damage and surface subsidence. The fracture zone damage contrast factor (KRFZ) and the surface damage contrast factor (KSSZ) were proposed as research indices. The greater the degree of damage weakening, the smaller KRFZ and KSSZ are. The average KRFZ is 0.165, and the average KSSZ is 0.845, indicating that in the OGS, damage weakening is greater in the fracture zone than at the surface. These results will provide new research ideas for the analysis of the OGS encountered in coal mining and can serve as references for similar geological and geotechnical research projects on the structural properties of strata.
Vorheriger Artikel Modelling the permanent strain of fine/coarse soil mixture with consideration of the effects of coarse grain content and suction by incorporating soil–water retention curve
Nächster Artikel The evolution characteristics of fractures in overlying rock for underground coal fires

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Metadaten
Titel
Effect of the roof cutting technique on the overlying geotechnical structure in coal mining
verfasst von
Jianning Liu
Manchao He
Jiong Wang
Alfonso Rodríguez Dono
Can Ming
Shan Guo
Peng Liu
Publikationsdatum
01.08.2023
Verlag
Springer Berlin Heidelberg
Erschienen in
Bulletin of Engineering Geology and the Environment / Ausgabe 8/2023
Print ISSN: 1435-9529
Elektronische ISSN: 1435-9537
DOI
https://doi.org/10.1007/s10064-023-03299-w

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