Stability Control Technology for Surrounding Rocks in Gob-Side Entry Driving with Small Coal Pillars under Dynamic Pressure

Guo, Shihao; Hu, Shanchao; Huang, Junhong; Gao, Zhihao; Cheng, Yafei; Han, Jinming; Yang, Lei

doi:10.3390/en16237887

Cited by 4 publications

References 21 publications

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Characteristics of surrounding rock damage and control technology of a facing-mining excavating roadway in north Shaanxi mining area

Zhang,

Yi,

Gang

et al. 2024

Sci Rep

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In a coal mine in the northern region of Shaanxi Province, China, a facing-mining excavating roadway exists, which is intended to be retained for subsequent working face safety services. This paper investigates the deformation and damage characteristics of the surrounding rock in different stages using FLAC 3D numerical simulation, taking the facing-mining excavating roadway of this coal mine as the research context. At 20 m ahead of the working face, a discontinuous plastic zone appears in the surrounding rock of the roadway, a phenomenon attributed to the varying hardness of the lithologyand termed 'plastic zone jumping.' The numerical simulation results have been were verified using drill hole peeping. Real-time monitoring of the roadway's stability is conducted on-site, showing that the roadway is significantly affected by mining at the 50 m point ahead of the working face. Based on the numerical simulation and on-site monitoring results, the support strength was increased at 50 m from the working face along the roadway, and a new support scheme was adopted. In the lagging section of the roadway, where mining pressure is strongly evident, differentiated reinforcement using anchor rods, anchor ropes, and W steel belts has been employed, resulting in a satisfactory on-site effect.

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Characteristics of surrounding rock damage and control technology of a facing-mining excavating roadway in north Shaanxi mining area

Zhang,

Yi,

Gang

et al. 2024

Sci Rep

View full text Add to dashboard Cite

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Characteristics of surrounding rock damage and control technology of a facing-mining excavating roadway in north Shanxi mining area

Zhang,

Yi,

Gang

et al. 2024

Preprint

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A coal mine in the northern region of Shaanxi Province, China, there is a facing-mining excavating roadway, to make the facing-mining excavating roadway to be retained for the next working face safety services. In this paper, the deformation and damage characteristics of the surrounding rock of the roadway in different periods are investigated by using FLAC 3D numerical simulation with the facing-mining excavating Roadway of this coal mine as the research background. At 20m ahead of the working face, a discontinuous plastic zone appeared in the surrounding rock of the roadway, and this phenomenon is a plastic zone jumping through due to the different hardness of the lithology. Real-time monitoring of the stability of the roadway is carried out using on-site measurement, and the roadway is affected by a large amount of mining in the 50m point of the working face in front of the roadway. Based on the numerical simulation and on-site monitoring results, the support strength was increased at 50m of the roadway over the working face, and a new support program was adopted. In the lagging section of the roadway, where the mine pressure is strongly manifested, anchor rods and anchor ropes with W steel belts are used to carry out differentiated reinforcing support, and the on-site effect is good.

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Fracture field evolution law of mining overburden rock under double-roof-cutting and retaining roadway conditions: a physical analog model and numerical simulation

Lv,

Hu,

Nian

et al. 2024

Preprint

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This study comprehensively combines physical analog modeling, numerical simulation, on-site monitoring, and other methods to explore the overburden rock fissure development characteristics under double-roof-cutting (DRC) with retained roadway conditions. The analysis of performed tests, simulations, and on-site monitoring proves that under the above mining conditions, the stress transfer between the roof plates of the open area and the roadway on both sides of the cut top is interrupted, the overburden load being retained in the middle of the open area. The stress in the middle of the open area of the former is increased by 5% compared with that of the latter, with a higher degree of stress increase. The amount of overburden rock subsidence in the open area of the former is reduced by 45 ~ 80% compared with the latter. Under DRC, heights of the overlying rock collapse and fissure zones are 18m and 40m, respectively, versus 15m and 46 m of those without roof-cutting. Fissures in both zones are the most developed, turning into gas transportation channels. This study findings provide theoretical basis for exploring the gas transportation patterns in double-cutting top tunnels.

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Stability Control Technology for Surrounding Rocks in Gob-Side Entry Driving with Small Coal Pillars under Dynamic Pressure

Cited by 4 publications

References 21 publications

Characteristics of surrounding rock damage and control technology of a facing-mining excavating roadway in north Shaanxi mining area

Characteristics of surrounding rock damage and control technology of a facing-mining excavating roadway in north Shaanxi mining area

Characteristics of surrounding rock damage and control technology of a facing-mining excavating roadway in north Shanxi mining area

Fracture field evolution law of mining overburden rock under double-roof-cutting and retaining roadway conditions: a physical analog model and numerical simulation

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