Coal mining method with near-zero impact on the ecological environment in a high-intensity mining area of Northwest China

Bai, Erhu; Guo, Wei; Zhang, Hebing; Tan, Yi; Ma, Zhibao; Wu, Dongtao; Guo, Mingjie; Wen, Peng

doi:10.1007/s10064-022-02574-6

Cited by 15 publications

(5 citation statements)

References 34 publications

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“…Secondly, based on multi-temporal remote sensing images, the changes of ecological environment quality in mining areas can be quantitatively analyzed through image classification and image change detection. Secondly, based on multi-temporal remote sensing images, the changes of ecological environment quality in mining areas can be quantitatively analyzed through image classification and image change detection (Han et al, 2021;Bai et al, 2022;Liu et al, 2022;Nie et al, 2022). As early as 2006, China's Ministry of Ecology and Environment promulgated the Technical Specifications for the Assessment of Ecological Environment Status, which is used to evaluate the ecological environment status and change trend in counties, provinces and ecological regions (China MoEaEotPsRo, 2015).…”

Section: Introductionmentioning

confidence: 99%

Ecological environment quality assessment and spatial autocorrelation of northern Shaanxi mining area in China based-on improved remote sensing ecological index

Zhu,

Cao,

Yang

et al. 2024

Front. Environ. Sci.

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The northern Shaanxi coal mining area is an important coal production base in China and an ecologically fragile area, and it is of great significance to explore the ecological environment quality and spatial evolution trend of the mining area. Based on Sentinel-2 and MODIS image data, an improved remote sensing ecological index was constructed by principal component analysis method: normalized difference vegetation index, normalized difference water index, normalized differential buildup and bare soil index, and net primary productivity. The ecological environment quality of the northern Shaanxi coal mining area and its influencing factors, as well as the spatial autocorrelation analysis of ecological environment quality, were discussed. The results showed that: 1) The vegetation coverage in the study area showed an overall increasing trend, but it was greatly affected by the average annual temperature. The NDVI index at the mine area is higher than the NDVI index at the non-mine area. 2) The water area gradually decreases with the year, which has a certain negative correlation with the total raw coal production. 3) The NDBB index showed a decreasing trend with the year, and compared with the non-mining area. 4) The coupling of year-by-year precipitation and temperature leads to interannual fluctuation of NPP value. 5) The change of ecological environment quality in the study area is the result of the comprehensive effect of natural factors and human factors. The implementation of ecological protection projects such as geological environmental protection and land reclamation in mining areas also has a certain impact on the trend of ecological environment quality. 6) There was a significant spatial autocorrelation in the quality of the ecological environment in the study area. There are significant “High-High” gathering areas of ecological environment quality within the coal mining area.

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Section: Introductionmentioning

confidence: 99%

Ecological environment quality assessment and spatial autocorrelation of northern Shaanxi mining area in China based-on improved remote sensing ecological index

Zhu,

Cao,

Yang

et al. 2024

Front. Environ. Sci.

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“…Because the mining area in western China is in the continental arid and semi-arid climate region, the water resources are deficient, the ecological environment is extremely fragile, and coal mining has a great impact on the geological environment 1 – 3 . Xinjiang, Northern Shaanxi, Shendong, and other mining areas have large reserves of coal resources, high calorific value, shallow buried depth, simple geological structure, and other natural advantages of mining.…”

Section: Introductionmentioning

confidence: 99%

Overburden failure and water–sand mixture outburst conditions of weakly consolidated overlying strata in Dananhu No.7 coal mine

Zhu,

Li,

Teng

et al. 2024

Sci Rep

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This study presents a case of weakly consolidated strata developed in Dananhu No.7 coal mine. Using a combination of numerical simulation, field measurement comparison, and the critical hydraulic gradient criterion, we investigate the overburden failure and the risk possibility of water–sand mixture inrush during excavation. The following are the principal findings: (1) Weakly consolidated rocks have poor physical characteristics, particularly when they are mudded and disintegrated after encountering water, which may become a favorable source of water–sand inrush; (2) The water-conducting zone develops to a height of 160.5 m with a crack-mining ratio of 15.29 times, extending upward to Toutunhe Formation aquifer. The predictions are consistent with measurements in adjacent mines with similar geological conditions; (3) Cracks without larger subsidence are developed at the front edge of the mining direction, and some parallel stepped cracks behind the goaf could be easily observed. Ground subsidence along the goaf center finally displays a symmetrically wide-gentle U shape; (4) The critical hydraulic gradient of Toutunhe Formation aquifer, aquifer above 3# coal seam, and aquifer of 3#–7# coal seam in Xishanyao Formation is 1.314, 1.351, and 1.380, the actual value is 0.692, 2.089, and 7.418 accordingly. It is inferred water–sand mixture outburst will not occur in Toutunhe Formation aquifer, while the potential risk exists in the aquifers of Xishanyao Formation. Through drainage and depressurization projects, a water–sand mixture outburst accident does not occur during excavation. This study reveals the overburden failure characteristics and the initiation mechanism of water–sand inrush in weakly cemented strata, as well as the internal relationship between them, which provides new research ideas for safe operation in other mining areas with similar geological conditions. The research work has certain practical guiding significance.

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“…Coal mining can give rise to significant ecological and environmental issues on the surface, including surface subsidence, structural damage of buildings, and loss of surface water resources [1][2][3][4][5]. The primary reason for these issues is the instability of the overlying strata beam, resulting from coal extraction [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Study on the Partial Paste Backfill Mining Method in a Fully Mechanized Top-Coal Caving Face: Case Study from a Coal Mine, China

Du,

Chen,

et al. 2024

Sustainability

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Paste backfill mining is an significant part of green coal mining, which can improve resource utilization and extend the service life of mines. It is important for solving the “three under, one above” mining problem and avoiding industrial wastes such as coal gangue and fly ash that occupy farmland and pollute the environment. To address the difficult filling problem of a fully mechanized top-coal caving face (FMT-CCF), a new method of partial paste backfill mining is herein proposed. First, the partial paste backfill mining method and implementation steps of the FMT-CCF are introduced in detail. Then, the mechanistic model of the roof beam in partial paste backfill mining is established. Then, the filling structural factors on the filling effect of the 42105 FMT-CCF are determined. Dependent on the assay of the migration law of overlying stratum after filling, numerical simulation analysis is used to research the feature effect of the main filling structural factors on the filling effect. Finally, the paste filling rate, filling width, and filling strength suitable for the 42105 FMT-CCF are obtained. When the filling rate reaches 100%, a significant alteration takes place, resulting in the efficient decrease of the overlying rock stress arch shell’s height. As the width of the filling body expands from 10 m at each end to 20 m, the stress arch of the overlying rock experiences maximum reduction, specifically decreasing by approximately 14 m. When the strength of the filling body is greater than 0.4 GPa, the filling effect is better. This study has important guidance and reference significance for the partial paste backfill of FMT-CCF in thick seam mining.

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Coal mining method with near-zero impact on the ecological environment in a high-intensity mining area of Northwest China

Cited by 15 publications

References 34 publications

Ecological environment quality assessment and spatial autocorrelation of northern Shaanxi mining area in China based-on improved remote sensing ecological index

Ecological environment quality assessment and spatial autocorrelation of northern Shaanxi mining area in China based-on improved remote sensing ecological index

Overburden failure and water–sand mixture outburst conditions of weakly consolidated overlying strata in Dananhu No.7 coal mine

Study on the Partial Paste Backfill Mining Method in a Fully Mechanized Top-Coal Caving Face: Case Study from a Coal Mine, China

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