Fractal characteristics of overburden fissures in shallow thick coal seam mining in loess gully areas

Li, Jianwei; Guo, Xinwei; Wu, Xiangye; Chen, Shijiang; Zhang, Ningbo

doi:10.1371/journal.pone.0274209

Cited by 2 publications

(1 citation statement)

References 29 publications

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“…classified mining cracks in the gully area into tensile cracks, extrusion cracks, collapse cracks, and sliding cracks and analyzed their formation mechanisms. Li (2021) analyzed the linkage between the development and distribution characteristics of overburden fractures and overburden activities in shallow buried thick coal seam mining in the gully area. The number of mining fractures in the downhill section of mining overburden was less than that in the uphill section, while the width of fractures showed an opposite trend.…”

Section: Introductionmentioning

confidence: 99%

Overburden stress evolution characteristics and prediction of disasters with across-gully mining

Wang

Jiang²,

Jiao³

et al. 2023

Front. Earth Sci.

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The coal water co-mining of shallow coal seams in the loess gully area of Northern Shaanxi is affected by the coupling effect of overburden rock structure and topography. The development characteristics of mining fracture are complex and can induce mining and environmental disasters. To predict the disaster formation, taking the 113101 working face of the Kunyuan Coal Mine as the engineering background, numerical simulation, physical similarity simulation experiment, and theoretical analysis methods were used to analyze the mining gully of a shallow coal seam in a loess gully area. Based on the dynamic evolution characteristics of stress at different locations, the formation positions, dynamic development, and evolution processes of various fractures were studied; disaster-causing mechanisms were revealed and comprehensive methods were proposed. The results showed that in across-gully mining, the maximum horizontal compressive stress at the bottom of Gully No. 2 was approximately 20.00 MPa, the maximum horizontal tensile stress of the reverse slope section was approximately 1.50 MPa, the width of the F5 fracture of Gully No. 2 was 46.00 cm, and the elevation difference was up to 52.00 cm. The working face across-gully mining formed tensile fractures in most areas, collapsed fractures at the gully bottom, and extruded fractures in the reverse slope section. The fracture at the gully bottom could easily induce water–sand inrush and roof caving and supports crushing. The slope fracture could also induce a gully-induced landslide. According to the mechanisms and distribution areas of fracture disasters, the disaster areas were divided into water–sand inrush areas at the gully bottom, roof caving and supports crushing areas at the gully bottom and at the base of the slope section, and landslide areas at the upper part of the slope section and reverse slope section. Appropriate prevention and control measures were proposed, such as the upstream interception of surface water, slope reinforcement in the middle and upper part of the downhill section, artificial precracking of the roof in the middle and upper part of the downhill section, and grouting reinforcement at the gully bottom and slope toe of the downhill section. These measures were proven to effectively guarantee the safe and efficient mining efficiency of the working face.

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Section: Introductionmentioning

confidence: 99%

Overburden stress evolution characteristics and prediction of disasters with across-gully mining

Wang

Jiang²,

Jiao³

et al. 2023

Front. Earth Sci.

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Simulation study on surface deformation of shallow buried coal seam mining in a gully area

Wang,

Cai,

Zhang

et al. 2023

Front. Earth Sci.

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Coal mining subsidence leads to frequent surface ecological and environmental problems. Due to the unique topographic conditions within gully areas, the deformation and damage characteristics, along with the evolution laws of the surface, have been difficult to analyze. To explore the surface movement and deformation law of shallow-buried coal seam mining in a gully area, this study designed a three-dimensional similar-material simulation test simulating the complete movement and deformation of the ground surface under real terrain conditions and proposed a complete data acquisition and processing scheme. Combined with the numerical simulation analysis, we utilized this scheme to analyze the dynamic influence law of coal seam mining in a gully area on the distribution of ground surface stress and displacement as well as on the dynamic characteristics of the ground surface damage. The results show that the existence of gully topography affects the stress distribution of the ground surface and the raw rock of the coal seams underneath and that there exists a stress concentration in the gully area of the ground surface. Furthermore, the mining activities of the coal seams lead to an increase in the degree of stress concentration in the gully area of the ground surface, and the slopes enter into the process of energy accumulation and sudden release, which makes the region prone to the occurrence of geological disasters such as landslides and collapses. In addition, the surface movement and deformation in the gully area are more intense, exceeding the plain area, and the surface movement is affected by the spatial location relationship between the mining area and the slope body, causing the center of the mining area to show obvious eccentricity characteristics. The results of this study provide a reference basis for the safe mining of coal mines in gully topography.

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Fractal characteristics of overburden fissures in shallow thick coal seam mining in loess gully areas

Cited by 2 publications

References 29 publications

Overburden stress evolution characteristics and prediction of disasters with across-gully mining

Overburden stress evolution characteristics and prediction of disasters with across-gully mining

Simulation study on surface deformation of shallow buried coal seam mining in a gully area

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