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    First, the general omen
(A) coal layer becomes wet, soft; help coal dripping occurs, the phenomenon of watering, and watering from small to large; sometimes appear to help iron rust coal water marks;
(B) reduced face temperature, or hydrogen sulfide odor occurrence or fog;
(3) Sometimes the smell of water is heard;
(4) The mine pressure is increased, and the roofing piece and the bottom drum are generated.
Second, the working surface floor limestone aquifer water inrush
(1) The pressure on the working surface is increased, the bottom plate is bulged, and the amount of the bottom drum is sometimes up to 500 mm or more;
(2) The crack in the bottom surface of the working surface is gradually increased;
(3) Water seepage along the fissures or coals. As the fissures increase, the amount of water increases. When the water seepage of the bottom plate increases to a certain extent, the coal seepage may stop. At this time, the water color is clear when it is clear, and when the bottom plate is active, the water becomes cloudy; when the bottom plate is stable, the water color becomes clear;
(4) The bottom plate is broken, and high-pressure water is sprayed along the crack, accompanied by a "beep" sound or a harsh underwater sound;
(5) The “bottom explosion†occurred in the bottom plate, accompanied by a loud noise, a large amount of groundwater poured out, and the water color was milky white or yellow.
Third, loose pore aquifer water inrush
(1) The water inrush from the water inrush, the dripping and the dripping phenomenon gradually increase, and it is observed that a small amount of fine sand is contained in the water;
(2) Local roofing occurs, the water volume suddenly increases and there is a flow of sand. The flowing sand is often intermittent, and the water color is mixed when it is clear. The general trend is that the amount of water and the amount of sand increase until a large amount of sand flows out;
(3) The roof is crushed and sanded. This phenomenon may affect the surface and cause collapse of the surface.
The above warnings are typical cases. In the process of specific water inrush accidents, they are not necessarily all manifested, so they should be carefully observed and carefully analyzed and judged.
Mine water inrush
The mine water inrush process is mainly determined by the mine hydrogeology and mining site conditions. The general water inrush accident can be summarized into two situations: one is that the water inrush is smaller than the maximum drainage capacity of the mine, the groundwater forms a stable falling funnel, forcing the mine to drain a large amount of water for a long time; the other is that the water inrush exceeds the maximum drainage capacity of the mine. Causes flooding of the entire mine or local mining area. Before the occurrence of various types of water inrush accidents, a variety of water inrush warnings are generally displayed.