Abstract
Coal mine gob, mined-out areas in underground coal mines, often accumulates explosive methane-air mixtures that pose a deadly hazard to miners. A good understanding of the flow field in a sealed coal mine area is crucial in preventing and minimizing accidents associated with mine combustible gases and also for planning and implementing a mine rescue strategy. In recent years, the research on the flow field in the gob has changed from qualitative research in the past to quantitative research. This paper synthesizes the research results of flow field in gob in recent 40 years, covering the permeability of quarried areas, the airflow simulation in quarried areas, and the influence of ventilation parameters and geohydrological conditions on the flow field. Firstly, the overburden failure mechanism and fracture development characteristics of the mine gob, the distribution of porosity and permeability in the gob, and the relationship between them are introduced. Secondly, the development of research methods and numerical models used to study the flow field in mine gob is discussed. The distribution of the flow field in the gob under different conditions is expounded. Thirdly, the research on the prevention and control of fire and explosion risks in the gob is discussed. Finally, the problems to be solved in such research direction are addressed and suggestions are put forward.
Highlights
The problem of gob disaster has been the focus of most researchers. e gob is the abandoned space after coal mining, and its internal medium is the falling gangue and residual coal, which is rich in pores and cracks
Porous media seepage dynamics, and numerical simulation, the research object is the space outside the underground roadway or the coal and rock area, which is aimed at directly revealing the nature and mechanism of disasters
Is paper will start from three aspects: the permeability of the gob, the theory of quarry flow field simulation, and the influence of environmental factors on the flow field distribution. It will explain the methods of setting the porosity and permeability of the gob in numerical simulation, compare different analysis methods of the quarry flow field problem, Shock and Vibration combine the quarry simulation experiments with relevant materials and the simulation results, and sort out the influence of different environmental factors on the gas flow situation in the gob. e research on the prevention and control of fire and explosion risks in the mined area is analyzed, and suggestions are made for future research directions of the mined area flow field
Summary
The problem of gob disaster has been the focus of most researchers. e gob is the abandoned space after coal mining, and its internal medium is the falling gangue and residual coal, which is rich in pores and cracks. Due to the wind pressure of air leakage flow in working face, the impact of roof failure, the power of gas emission, the fire pressure of spontaneous combustion of residual coal and other external forces, the mixed gas flows in the gob, and the concentration of components change, so the flow field distribution is very complex [1]. The gob is prone to spontaneous combustion of residual coal, which provides a long-term fire source for gas explosion and causes secondary gas explosion, resulting in serious consequences of accident disasters. In-depth study of the flow field distribution in the gob is conducive to mastering the flow of mixed gas and reveals the mutual transformation law of gas combustion and explosion in the gob, which is of great significance for the prevention and control of coal spontaneous combustion and gas explosion disasters. It will explain the methods of setting the porosity and permeability of the gob in numerical simulation, compare different analysis methods of the quarry flow field problem, Shock and Vibration combine the quarry simulation experiments with relevant materials and the simulation results, and sort out the influence of different environmental factors on the gas flow situation in the gob. e research on the prevention and control of fire and explosion risks in the mined area is analyzed, and suggestions are made for future research directions of the mined area flow field
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