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Erschienen in: Bulletin of Engineering Geology and the Environment 3/2024

01.03.2024 | Original Paper

Strong strata behavior mechanism and roof cutting control of small pillar gob-side roadway in extra-thick coal seam

verfasst von: Wenli Zhai, Fulian He, Jiayu Song, Yanhao Wu, Xuhui Xu, Deqiu Wang, Jianlong Zhang, Liang Li

Erschienen in: Bulletin of Engineering Geology and the Environment | Ausgabe 3/2024

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Abstract

In Datong mine, the extraction of coal resources faces challenges due to strong strata behavior and significant deformation of gob-side roadways during working face extraction. To address these challenges and control major surrounding rock deformation, wide pillar, design, robust support systems, hydraulic fracturing, and roof cutting by explosives are often employed. To further improve safety and efficiency, this article proposes the application of carbon dioxide phase transition fracturing (L-CO2) for roof cutting in small pillar gob-side roadways. Field investigation, theoretical analysis, numerical simulation, and on-site tests were conducted to evaluate the performance of the proposed scheme. The results indicate that the main roof break position is approximately 6.8 m from the coal wall on the gob side. It is observed that after roof cutting, the second deviatoric stress invariant (J2) of the overlying rock strata shifts about 5 m into the solid coal side. The peak J2 of surrounding rock is reduced by approximately 150 MPa2 for the roof and around 20 MPa2 for the roadway sidewalls. The peak third invariant (J3) shifts about 10 m away from the roadway. Through on-site testing, fracturing parameters were determined and a L-CO2 control scheme was developed for small pillar gob-side roadways in extra-thick coal seams. The proposed scheme was validated through field applications.

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Literatur
Zurück zum Zitat Gidley JL, Holditch SA, Nierode DE (1989) Recent advances in hydraulic fracture. Soc Pet Eng Monogr 452 Gidley JL, Holditch SA, Nierode DE (1989) Recent advances in hydraulic fracture. Soc Pet Eng Monogr 452
Zurück zum Zitat Hoek E, Brown ET (1980) Underground excavation in rock. The Institute of Mining and Metallurgy, London UK Hoek E, Brown ET (1980) Underground excavation in rock. The Institute of Mining and Metallurgy, London UK
Metadaten
Titel
Strong strata behavior mechanism and roof cutting control of small pillar gob-side roadway in extra-thick coal seam
verfasst von
Wenli Zhai
Fulian He
Jiayu Song
Yanhao Wu
Xuhui Xu
Deqiu Wang
Jianlong Zhang
Liang Li
Publikationsdatum
01.03.2024
Verlag
Springer Berlin Heidelberg
Erschienen in
Bulletin of Engineering Geology and the Environment / Ausgabe 3/2024
Print ISSN: 1435-9529
Elektronische ISSN: 1435-9537
DOI
https://doi.org/10.1007/s10064-024-03560-w

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