A Numerical Investigation of the Stress Relief Zones Around a Longwall Face in the Lower Seam for Gas Drainage Considerations

Zhang, Chunlei; Chugh, Yoginder P.; Feng, Ruimin; Yong, Zhang; Shen, Wei; Wu, Jing; Yang, Yushun

doi:10.32604/cmes.2021.014665

Cited by 3 publications

(1 citation statement)

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“…Mining-induced fractures in the surrounding rock are channels for gas diffusion and accumulation. Studying the dynamic evolution law of surrounding rock fractures during mining has important basic significance for improving gas extraction systems and preventing gas disasters [1][2][3]. After protective layer mining, the stress balance state of the surrounding rock is disrupted, and the rock layers of the roof and floor of the coal seam begin to move and rupture toward the gob, causing the overlying rock stress to redistribute gradually [4].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Dynamic Evolution of Surrounding Rock Movement and Stress-Fracture in the Upward and Repeated Mining of Close-Distance Coal Seams

Peng,

Zhang,

Feng

et al. 2024

Advances in Civil Engineering

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The distribution of mining-induced stress and the resulting rock fractures are two crucial factors affecting mineral extraction in protective layer mining. This research establishes a correlation between the vertical fracture aperture and the second derivative of the rock layer’s subsidence curve equation. The article explores the span requirement for a simply supported beam to fracture. This condition is relevant to understanding the dynamic evolution of rock movement and stress fractures during repeated mining of close-distance coal seams. Our study investigates alterations in rock stress and fractures resulting from repeated upward mining of coal seams, using the nearby coal seam cluster in Jincheng Mine as a case study. The research findings indicate that during the mining of the upper coal seam, the roof experiences significant but brief periodic loading intervals, as well as severe and moderate periodic loading. As mining progresses to the lower coal seam, pressure relief of the upper coal seam gradually increases in both degree and range. In the upper coal seam, the vertical stress distribution follows a sequence of “V,” “U,” and “W” forms. The upper coal seam undergoes five stages of expansion deformation: compression, expansion, increased expansion, decreased expansion, and stable expansion.

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