Abstract
On 22 May 2017, a groundwater inrush accident occurred in the gob area of coal floor at Dongyu Coal Mine in Qingxu County, Shanxi Province, China. The water inrush accident caused great damage, among which six people died and the direct economic loss was about CNY 5.05 million. An elliptical permeable passage appeared at the floor of the water inrush point, and the lithology of the outburst is mainly fragmented sandy mudstone and siltstone of coal roof No.2 in the lower layer of coal seam No.3, which is currently being mined, with a peak inflow of 500 m3/h. The water inrush happened due to following reasons: There is an abandoned stagnant water-closed roadway in coal seam No.2, which is the lower mine group of coal seam No.3. The abandoned roadway of coal seam No.2 is an inclined roadway. The water level of the roadway far away from the accident point is higher than the floor elevation of coal seam No.3. Under the joint action of water pressure, mining disturbance, and weakening of goaf water immersion, the original equilibrium state was broken, resulting in the destruction of the only 7 m water-barrier rock pillar between coal seam No.3 and coal seam No.2. The water in the goaf led upward along the roof crack, gradually evolved from seepage to gushing water, and a large amount of goaf water poured into the roadway in the working face of the 03304 panel, finally leading to the occurrence of catastrophic water inrush. Technically, the miners did not implement the technical provisions of the coal mine water control regulations, leading to the accident. In addition, the failure to arrange evacuees to a safe location after apparent signs of water inrush also increased the catastrophic level of the accident.
Highlights
The number of water inrush accidents in goaf accounted for 67.7% of the total, and the death toll was as high as 76.6%
On 22 May 2017, a disastrous groundwater inrush occurred at Dongyu coal mine in Qingxu, Shanxi, China
The groundwater inrush originated from the floor failure in the 03304 appraisal lane in coal seam No
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Water inrush sometimes occurs in coal mines under the background of high production capacity. The number of accidents and the number of deaths have been significantly reduced, but the proportion of goaf water inrush accihavehas been significantly but the Shanxi proportion of province goaf watermost inrush accidents is dents is alwaysdeaths high and brought great reduced, damage [9,10,11]. There is still a long way to go in the study of goaf water inrush accidents. 1. Details of some properties of water inrush accidents to 2020 in China. 1. Details of some properties of water inrush accidents fromfrom to 2020 in China. All All of these effectively the occurrence of inrush water inrush accidents coal mines.
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