(1) 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 traces of water.
(2) reduced face temperature, or fog occurs or hydrogen sulfide odor (i.e., rotten egg smell).
(3) Sometimes you can smell the sound of water.
(4) The mine pressure increases, and the gangs, tops and bottoms occur.
2) Water inrush from the limestone aquifer of the working face floor:
(1) The pressure on the working surface increases, and the bottom plate is lifted. The amount of the bottom chamber can sometimes reach 500mm or more.
(2) The bottom surface of the working surface is cracked and gradually increases.
(3) Water seepage along the fissure or coal gang. As the fissure increases, the amount of water increases. When the amount of water seepage increases to a certain extent, the coal seepage may stop. At this time, the water color is clear when turbid: when the bottom plate is active The water becomes turbid, and the water color becomes clear when the bottom plate is stable.
(4) The bottom plate is broken, and high-pressure water is sprayed along the crack, accompanied by a "beep" sound or a harsh water sound. (5) The bottom plate has a "bottom explosion" accompanied by a loud noise, and a large amount of groundwater is poured out, and the water color is milky white or yellow.
3) Loose pore aquifer water inrush:
(1) The water inrush from the water inrush is dripping, dripping, and the dripping phenomenon gradually increases. It is observed that a small amount of fine sand is contained in the water.
(2) Local roofing occurs, water volume suddenly increases and there is quicksand. The quicksand is often intermittent, and the water color is clear when it is clear. The general trend is that the amount of water and sand increase, until the quicksand gushes. (3) The roof is crushed and sanded. This phenomenon may affect the surface and cause collapse on the surface.
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