Effect of mining parameters on surface deformation and coal pillar stability under customized shortwall mining of deep extra-thick coal seams

Jiang, Shuyin; Fan, Gangwei; Li, Qizhen; Zhang, Shizhong; Chen, Liang

doi:10.1016/j.egyr.2021.04.008

Cited by 16 publications

(5 citation statements)

References 16 publications

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“…This method can change the continuous large mined-out area into closed small goafs, so as to play a certain role in controlling the roof stability. However, if a coal pillar is unstable, it is easy to cause a large area of collapse, and the coal recovery rate is low, furthermore the reserved permanent coal pillar will waste a lot of mineral resources [24][25][26].…”

Section: Supporting Methodsmentioning

confidence: 99%

Research on goaf treatment and geothermal comprehensive utilization technology in coal mining subsidence area

Yang

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Goaf treatment and comprehensive utilization of geothermal energy are great significance to the restoration of land resources and sustainable development of energy in coal mining subsidence areas. In this paper, goaf treatment technology and geothermal energy development technology are reviewed in detail. Among them, the goaf treatment technology mainly includes: caving treatment method, filling treatment method, support method, closed isolation method and joint treatment method. Geothermal development technology mainly includes: shallow ground source heat pump technology, coaxial casing development technology, pumping and reinjection technology, directional drilling technology, U-type precision docking drilling technology. The systematic idea of filling treatment and geothermal comprehensive utilization in coal mining subsidence area is proposed, and the technology is described in detail through three cases. The research results can provide innovative inspiration for subsidence control and comprehensive utilization of geothermal energy in coal mining subsidence area, and has broad application prospects.

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Section: Supporting Methodsmentioning

confidence: 99%

Research on goaf treatment and geothermal comprehensive utilization technology in coal mining subsidence area

Yang

2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…Coal is a key component of China's energy structure, accounting for 60% of the total annual energy consumption 2 . It has been identified that long-term and high intensive underground mining can lead to a series of problems such as surface subsidence, water level drawdown and vegetation deterioration, further affecting localized ecology and environment 3 , 4 . Reasonable evaluation of eco-environment in mining area is helpful to analyze the sustainable development of mining area and put forward corresponding countermeasures for eco-environment management in mining area 5 .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of eco-environmental quality for the coal-mining region using multi-source data

Jiang

Fan

Zhang

et al. 2022

Sci Rep

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The contradiction between the exploitation of coal resources and the protection of the ecological environment in western China is becoming increasingly prominent. Reasonable ecological environment evaluation is the premise for alleviating this contradiction. First, this paper evaluates the eco-environment of Ibei coalfield by combining the genetic projection pursuit model and geographic information system (GIS) and using remote sensing image data and other statistical data of this area. The powerful spatial analysis function of GIS and the advantages of the genetic projection pursuit model in weight calculation have been fully used to improve the reliability of the evaluation results. Furthermore, spatial autocorrelation is used to analyze the spatial characteristics of ecological environment quality in the mining area and plan the specific governance scope. The geographic detector is used to determine the driving factors of the eco-environment of the mining area. The results show that Ibei Coalfield presents a spatially heterogeneous eco-environment pattern. The high-intensity mining area (previously mined area of Ili No.4 Coal Mine) has the worst ecological environment quality, followed by the coal reserve area of Ili No.4 Coal Mine and the planned survey area of Ili No.5 Coal Mine. The eco-environment quality (EEQ) of the study area is affected by both human and natural factors. Mining intensity and surface subsidence are the main human factors affecting the ecological environment in the study area. The main natural factors affecting the ecological environment in the study area are annual average precipitation, elevation, annual average evaporation, NDVI and land use type. Meanwhile, the interaction effect of any two indicators is greater than that of a single indicator. It is also indicated that the eco-environment of the mining area is nonlinearly correlated to impact indicators. The spatial autocorrelation analysis shows three areas that should be treated strategically that are the management area, close attention area and protective area. Corresponding management measures are put forward for different regions. This paper can provide scientific references for mining area eco-environmental protection, which is significant for the sustainability of coal mine projects.

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“…Kumar et al [ 19 ] proposed a probabilistic method to analyze the stability of coal pillars, providing additional design criteria on the traditional design criteria for pillar stability safety coefficient to select the optimal safety coefficient of pillars to improve the recovery ratio of coal mine. Jiang et al [ 20 ] proposed a method to optimize customized short-wall mining parameters in deep and extra-thick coal seams, aiming to meet the coal pillar stability requirements and achieve the maximum coal recovery rate. Guo et al [ 21 ] found that the width of the plastic zone of coal pillars in deep mines increased significantly through field measurements and three-dimensional similar material simulation experiments.…”

Section: Introductionmentioning

confidence: 99%

Study on Safety Coefficient of Sedimentary Bauxite Strip Pillar under Valley Terrain

Jiang

Jiao

Xie

et al. 2022

IJERPH

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The underground sedimentary bauxite ore body in Shanxi province has a shallow burial depth; the valley terrain caused stress concentration on a pillar which affected the pillar’s safety and goaf stability. This paper proposed a pillar safety coefficient calculation method affected by the goaf structural parameters and the valley terrain, which was based on a pillar mechanics analysis under the valley terrain. The results show that the overlying valley terrain will cause stress concentration on the pillar, reducing the adequate bearing capacity and the pillar stability. The increase of the goaf span b and the height of the pillar h is extensively detrimental to pillar stability. Meanwhile, increasing the pillar burial depth would cause the pillar to weaken, but can effectively decrease the influence of the valley terrain. Furthermore, when the angle between the goaf strike and the valley strike β < 50°, β has a more significant impact on the stress concentration and safety coefficient. The stability of an underground sedimentary bauxite pillar is calculated by the method, the result complied with the actual situation.

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Effect of mining parameters on surface deformation and coal pillar stability under customized shortwall mining of deep extra-thick coal seams

Cited by 16 publications

References 16 publications

Research on goaf treatment and geothermal comprehensive utilization technology in coal mining subsidence area

Research on goaf treatment and geothermal comprehensive utilization technology in coal mining subsidence area

Evaluation of eco-environmental quality for the coal-mining region using multi-source data

Study on Safety Coefficient of Sedimentary Bauxite Strip Pillar under Valley Terrain

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