Treatment of the worst mine flooding accident

2022-08-18
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Treatment of mine flooding accidents

I. Analysis of the living conditions of the trapped people in the mine flooding

after the mine flooding, miners are often trapped underground, waiting for rescue in appropriate places. In the process of rescue and disaster relief, leaders at all levels and disaster relief commanders must follow the principle of "active rescue", strive for time and speed, and strive to make the people in distress get out of danger as soon as possible. However, sometimes, this situation occurs: the people in distress can only use the "skylight" time at night to carry out construction. When they have not been rescued within a long period of time, some people think that they cannot be rescued alive, so they have little determination and confidence. Especially when the external water level is higher than the elevation of the working place of the people in distress, it is considered that the people in distress have lost their living conditions, and they are slow in rescue, or even lose their lives. Therefore, it is necessary to analyze the living conditions of the people trapped underground after the flood according to the technical data and the actual situation, so as to know well

the survival conditions and survival time of the trapped people are explained by the analysis of the possibility of air in the trapped place, the changes of air composition and the physiological changes of the trapped people

(I) analysis of the possibility of air in the trapped place of the people in distress after the flood in the lower reaches

air is the primary condition for the survival of the people in distress. As long as there is space, there is air, and people have the possibility of survival. Therefore, after a mine flood, the heart must conduct scientific analysis according to the water permeability to judge whether there is air in the place of distress

(1) when the elevation of the distress site is higher than the elevation of the external water level, it is completely certain that there is air in the distress site without special circumstances

(2) when the elevation of the distress site is lower than the elevation of the external water level, the situation is more complex. According to the specific situation of mine flooding, it can be roughly divided into two categories:

① when a water seepage accident occurs underground, the heat is generally fierce, and the flood flows downward, squeezing out the air in the lower roadway, so that the lower roadway is flooded. That is to say, when a water seepage accident occurs underground, the flood can directly flow into the roadway located at the lower part of the water seepage point, and there will be no air

② after the mine water seepage accident, the flood often first submerges the lower horizontal roadway or inclined roadway, so that these roadways do not have the gap to discharge air. However, the upper roadway connected with the structures of these roadways and fixtures has its own advantages and disadvantages. If there is no air leakage, even when the external water level elevation is higher than it, it will not be submerged, and there is air in the roadway

for example, a mine encountered an old kiln ponding area when grinding into the track and going up the hill after 20 years of excavation. The flood first flooded the track and the horizontal roadway at the entrance of the belt going up the hill, so that the air at the head of the belt going up the hill can not be discharged. Therefore, there is air at the head of the belt going up the hill. Thirteen miners were trapped in this space. Moreover, at that time, the external water level was 54m higher than the elevation of the anti climbing excavation head, that is, the air pressure at the trapped place reached 6.4 atmospheres. At that time, there was an air duct leading to the upper part of the trapped place. After the water flooded, someone opened the compressed air duct in order to supply air to the trapped place. However, the air in the trapped place is discharged outward through the compressed air pipe, so that the water level in the trapped space rises. When one person in distress found it, he closed the compressed air duct in time, so as to prevent the water level in the trapped place from rising due to air leakage. As the disaster relief personnel worked against time to strengthen the drainage progress, after nearly 100 hours of efforts, the trapped people were finally rescued. As the water level rises slowly during water penetration and falls slowly during drainage, the human body basically maintains the internal and external pressure balance in this process. Therefore, when personnel rescue is generally realized through a special cupping machine, the change of external pressure has little impact on the human body

(II) analysis of air quality in underground trapped places

1 The factors causing the decrease of oxygen concentration are:

(1) oxidation of organic matter

(2) coal and rock release gas, carbon dioxide, etc., so that the oxygen concentration in the air is relatively reduced

(3) the breathing of people in distress consumes oxygen, which is the main reason for low oxygen concentration. When the people in distress are blocked, they will take some drastic actions at first, but when they find that there is no access escape area, they will generally lie flat and wait for help. However, as mentioned in Section 6 of this chapter, when the oxygen concentration is less than 10%, there is a danger to life

2. Increase of carbon dioxide concentration

(1) the factors causing the increase of carbon dioxide concentration include: ① oxidation of organic matter, consumption of oxygen, release of CO2 and other gases. ② Release CO2 from coal or rock or press the CO2 gas in the old goaf into the place where the people in distress are trapped when it is permeable, so as to increase the CO2 concentration in the air. ③ When breathing, the people in distress emit CO2, which is the main reason for the increase of CO2 concentration

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