Investigation of Gas Explosion Pattern in an Underground Mine Gob and Overlying Strata Using Physical Simulation Approach
Coal gas explosions m an underground mine gob often cause serious injuries and fatality accidents for miners in and around underground mine working faces.It is well-known that the coal gas volumetrically concentration must be maintained below 1% in an active mine ventilation system in order to avoid any gas explosion hazards.However, due to the large gas emissions fiom the residual coal as well as coal seams behind the mining working faces and ventilation air leakages into gob and caved spaces, the compositions of atmosphere of the mine gob and parts of vertical caved zones would have a great change.Hence, the gas concentration could be built up to reach the explosion limit and to form the gas explosion zones.Once a spark appears to ignite such gas, an explosion event can be expected.Therefore, it is good for mining engineers to detailed know where the explosion zones are and how they could change.In this paper, based on the dimensional analysis method, a 3D physical experimental model is designed to simulate a U-type underground mine working face.The coal seam strata are modelled using physical materials and the ground pressure is also considered using the designed hydraulic system.In this experiment, the most important two influence factors, which are the air quantity delivered into the ventilation system and the gas release rate (GRR) in gob, are considered.A series combination of air quantity and GRR are designed and gas sampling work on difference locations are conducted for analyzing concentrations.The experimental results show patterns of explosion zones in gob as well as overlying caved space when changing the GRR and air quantity.This research work is good for guiding mining engineers carefully applying the ventilation design practices to minimize the explosion hazard risk and also performing any gas drainage work to effectively reduce the amount of gas in mine gob area.
gob gas physical simulation underground ventilation explosion hazard control
CHENG Jianwei LI Siyuan
Key Laboratory of Gas and Fire Control for Coal Mines, College of safety engineering, China University of Mining and Technology, Xuzhou221116, Jiangsu, China
国际会议
The 2016 International Symposium on Safety Science and Technology(2016安全科学与技术国际会议)
昆明
英文
554-565
2016-10-17（万方平台首次上网日期，不代表论文的发表时间）