Underground mine workers generally judge that the mine may be permeable (water inrush) according to the following symptoms:

First, the wall of the roadway “hangs sweat”, that is, the water accumulates on the rock surface through the microporous cracks. The top plate "hanging sweat" is mostly pointed water drops, and there is a tendency of "pressure-bearing and dripping", which can distinguish the "hanging sweat" in the natural omen, the latter is usually a flat water drop, which is formed by vapor condensation on the Dingding. ;

Second, the top plate is drenched with water, just like falling rain;

Third, sometimes the floor is suddenly flooded before the water is permeable;

Fourth, the working surface temperature drops, the air becomes cold, and fog is generated;

5. There is a sound of water in the rock formation. This is because the water accumulated in the flooded roadway has a large water pressure, which can squeeze the water out of the cracks in the rock layer, and the water and the cracks on both sides of the crack cause a "squeaky" water scream, indicating a danger of water inrush.

Sixth, there is a pressure water flow, which is a sign that is very close to the water source. If the effluent is clean, it is slightly farther away from the water source. If the effluent is turbid, it indicates that it is approaching the water source;

7. Increased harmful gases in the working face. Generally, the gases emitted from the water-storing area are biogas, carbon dioxide and hydrogen sulfide;

Eight, the mining site or roadway "hanging red", the water's acidity is large, the taste is sturdy, there is a smell of rotten eggs.

Of course, the mine water is different, and the signs are different:

For the old empty water, it usually belongs to “dead water”, so “hanging red”, acidity and water smell are very good: for fault water, the working surface is generally pressed and the water is increased. This kind of water is mostly “live water”. If fault water is encountered in the roadway, mud can sometimes be seen in the rock crack; for cave water, it is often encountered in the limestone layer, sometimes the roof is pressed, the column is seepage, and the crack is soaked. It is yellow or gray with odor; for impact layer water, this kind of water is often encountered when drilling the wellbore in the shallow part. Generally, the water starts to be small, yellow, and there is sediment, and the amount of water becomes larger afterwards.

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