Abstract
A serious groundwater inrush occurred at the Wangjialing coal mine on March 28, 2010. Great effort from all over the country was taken during the postaccident rescue. However, triggered by accumulated water in the upper abandoned tunnels and goafs of a nearby closed individually owned coal mine, it caused great damage, including 38 deaths and direct economic losses of over 49 million yuan. The inrush water was from the abandoned tunnels and goafs, which were filled subsequently by groundwater from the sandstone aquifer in the roof of the coal seam. The passage formed in the west roof of the heading face of the air return tunnel in the 20101 first mining face. Unidentified distribution and water-filled degree of the abandoned tunnels and goafs are critical bases for the accident. That important regulations for abundant groundwater exploration and release were not carried out thoroughly was another fatal cause leading to the accident. The poor awareness of water hazard controlling also contributed to the accident to a large extent.
Highlights
Due to the complicated geological conditions induced by increasing mining depth, water inrush disasters have occurred at several coal mines in China, the numbers of accidents and deaths caused by them are decreasing [1, 2]
The inrush water was from the abandoned tunnels and goafs due to nearby mining in the No.[2] coal seam of a closed individually owned coal mine, which were filled subsequently by groundwater from the sandstone aquifer in the roof of the coal seam
The passage formed in the west roof of the heading face of the air return tunnel in the 20101 first mining face
Summary
Due to the complicated geological conditions induced by increasing mining depth, water inrush disasters have occurred at several coal mines in China, the numbers of accidents and deaths caused by them are decreasing [1, 2]. Many researches have been conducted due to great damage of the water inrushes that occurred at coal mines all over the world. Probability assessment, and control techniques of the water inrushes were key issues to be solved. With underground coal mining going on, many effective and comprehensive techniques formed and began to be applied for control of the water inrushes [24, 25]. The discharging techniques are applied to decrease pressures of the confined water from the roof and floor of coal seams to safe values for the safe underground mining. The accident drowned 38 miners and caused direct economic losses of over 49 million yuan in the end
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