What should I do if there are signs of water permeability?

1. When there are signs of water permeability, the operation must be stopped immediately and reported to the dispatch room.

2. If the situation is urgent, immediately issue an alarm and evacuate the location threatened by flooding.

3. In the event of a water permeability accident, the leaders or old workers on the site should immediately organize a rescue and report to the dispatch room at the same time. If the amount of water is too large and it is difficult to block the water outlet, it is necessary to evacuate to a safe place along the disaster evacuation route in an organized manner under the leadership of the squad leader or veteran workers.

4. If the water is rapid and the water flow is rapid, the on-site personnel should avoid the water outlet and the water flow, and hide in the chamber or turn to a safe place.

5. If the water is empty and the harmful gases at the location increase, you should wear a self-rescuer immediately.

6. After the water inrush accident, no one is allowed to enter the disaster area without wearing protective equipment.

7. In case you are blocked inside, you should be well prepared.

In the process of excavation, in case of mined-out water, water accumulation in the ancient empty area, and near the fault collapse column, in order to prevent and eliminate the hazard of water inrush, the following safety measures shall be implemented when the signs of water permeability occur:

1. When the following signs of permeable water occur in the mine, it is necessary to evacuate personnel urgently.

1) Signs of old empty water permeability.

The old empty water generally accumulates for a long time, the water supply is poor, and the organic matter undergoes a reduction reaction.

Later, the sulfur content is higher, and the old empty water often has rotten eggs.

Smell. The signs of water permeability are: red, acidic, watery, and astringent.

2) Signs of karst water permeability.

Due to long-term erosion of karst, the water is mostly gray or gray-yellow, and sometimes there is a phenomenon of red. When the mining roadway is close to the karst aquifer, there may be phenomena such as the roof and bottom plate to pressure water seepage.

3) Signs of fault permeability.

The groundwater in the fault fracture zone is generally flowing, and the recharge is relatively sufficient, and there is rarely a red phenomenon, and the water has no astringency but is sweet. Because there are debris such as silt in the fault fracture zone, the water is more turbid and yellow, and there will be phenomena such as increased pressure and drenching.

If there is an indication of water penetration at the mining face or other locations, the operation must be stopped, measures must be taken, and the mine dispatch room must be reported. In the event of a critical situation, an alarm must be issued immediately to evacuate all personnel from the water-threatened location. In the first 4 cases, the excavation must be stopped immediately, the support must be reinforced, and the water must be probed and discharged.

1. Hanging red: Because the mine water contains iron oxides, there is dark red rust on the surface of the cracks when the water passes through the cracks in the coal seam or rock formation.

2. Hanging sweat: When the mining face is close to the water accumulation area, the water gathers into many water droplets on the coal wall and rock wall through the cracks of the coal rock under its own pressure, but sometimes the moisture in the air will condense into water droplets when it encounters low temperature coal, which is an illusion. Therefore, when encountering hanging sweat, it is necessary to pay attention to distinguish the authenticity, and the method is to observe whether the fresh surface of the coal rock also has moisture, if the coal rock is wet, it is a sign of water permeability.

3. The air becomes cold: when the working face is close to a large amount of water, the temperature drops suddenly, the coal wall is cold, and people have a cool feeling as soon as they enter, and the longer the time, the more they feel cool. However, in mines that are greatly affected by geothermal heat, the groundwater temperature is high, and the temperature rises when the mining face is approaching.

4. Fogging: When the temperature in the roadway is very high, the water seeps into the coal wall, causing evaporation and rapid formation of fog.

5. Water calling: the high-pressure water accumulation in the underground mine, the strong extrusion of the coal and rock cracks and the friction of the two walls and hissing, indicating that the mining face is very close to the water accumulation area, if the coal roadway is excavated, water penetration is about to occur, at this time the alarm must be issued immediately, and all the personnel threatened by the water must be evacuated.

6. Floor bulging: There are two reasons for the bottom plate bulging, one is the result of the combined action of the hydrostatic pressure of the confined aquifer water (or water accumulation area) and the mine pressure of the bottom plate, which is a porter of water permeability; The other is the unilateral action of the mine pressure to produce the bottom drum, which generally does not burst into the water. Therefore, when the bottom drum occurs in the roadway, on the one hand, send people to monitor the development and change of the bottom drum, and on the other hand, report to the mine dispatching room to determine the cause of the bottom drum in time.

If it is confirmed that the cause is caused by water pressure, treatment measures should be taken promptly. There are two reasons for the occurrence of floor bulging, one is the result of the combined effect of the hydrostatic pressure of the confined aquifer water (or water accumulation area) and the mine pressure of the floor under the confined aquifer, which is a precursor of water permeability; The other is the unilateral action of the mine pressure to produce the bottom drum, which generally does not burst into the water. Therefore, when the bottom drum occurs in the roadway, on the one hand, send people to monitor the development and change of the bottom drum, and on the other hand, report to the mine dispatching room to determine the cause of the bottom drum in time.

If it is confirmed that the cause is caused by water pressure, treatment measures should be taken promptly.

After the occurrence of signs of water permeability, it is better to turn off the permeable water source in time and then deal with it.

The rise of the groundwater level and the appearance of water vapor and water droplets.

Rise of underground water level: During the excavation or construction process, the groundwater level has shown a clear upward trend, indicating that the possibility of groundwater influx into the project area has increased, and measures need to be taken to deal with it in time.

The appearance of water vapor and water slag beads: In the process of underground excavation or tunnel construction, water vapor and water beads appear on the wall or ground, indicating that groundwater has begun to infiltrate in the project area and needs to be treated urgently.