Abstract
In order to reveal the occurrence mechanism of coal and gas outburst and optimize the measures to prevent the disaster, a coal mine in Henan Province was undertaken as the research background. Based on the geological and mining conditions of the coal mine, the gas geological analysis method is applied to determine the outburst occurrence and to classify the risk levels. A multifactor pattern recognition method is used to determine the risk probability of the dynamic disasters such as coal and gas outburst. The relationship between geological structure, rock mass stress, and mine dynamic hazards is determined using geo-dynamic division method and FLAC3D numerical simulation. The occurrence and manifestation characteristics of the dynamic hazards are determined. COMSOL Multiphysics software is used to evaluate the original prevention measures and to optimize the measures. The research results determine the main influencing factors and regional distribution law of coal and gas outburst, which is of great significance to the risk prediction and prevention of dynamic disasters such as coal and gas outburst.
Highlights
Coal and gas outburst is an instantaneously destructive geo-phenomenon caused by complex interactions among the gas, coal seam, rock mass, and ground stress [1, 2], which is a typical dynamic disaster in coal mines
Under considerations of the geological and mining conditions of the coal mine, the high risk outburst areas are determined using the gas geological analysis method, geological dynamic division method, multifactor pattern recognition method, and FLAC3D numerical method, respectively. e geological and ground stress aspects related to coal and gas outburst are comparatively studied. e prevention measures in 31020 and 17220 working faces are analyzed using COMSOL Multiphysics software. e research results reveal the main influence factors and regional distribution of coal and gas outburst, which is of great significance to the risk prediction and prevention of coal and gas outburst
According to Cluster 200 in Chinese Coal Mine Safety Regulations 2016, gas geological maps in a coal and gas outburst mine must be compiled and updated in time, and the renewal period should be less than one year
Summary
Coal and gas outburst is an instantaneously destructive geo-phenomenon caused by complex interactions among the gas, coal seam, rock mass, and ground stress [1, 2], which is a typical dynamic disaster in coal mines. Many scholars have carried out numerous scientific research studies with regarding to the energy source and occurrence mechanisms of coal and gas outburst and achieved considerable research results. Results revealed that in the initial stage of coal and gas outburst, stress concentration occurred in surrounding rock mass and coal seam. In coal and gas outburst study, scholars have carried out various preventive measures and considerable experiences. Dynamic disasters such as coal and gas outburst are complex phenomena, and the occurrence mechanism and development characteristics of the disaster are not clear yet due to the complexity and diversity of geological conditions. Under considerations of the geological and mining conditions of the coal mine, the high risk outburst areas are determined using the gas geological analysis method, geological dynamic division method, multifactor pattern recognition method, and FLAC3D numerical method, respectively. e geological and ground stress aspects related to coal and gas outburst are comparatively studied. e prevention measures in 31020 and 17220 working faces are analyzed using COMSOL Multiphysics software. e research results reveal the main influence factors and regional distribution of coal and gas outburst, which is of great significance to the risk prediction and prevention of coal and gas outburst
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