At 12:10 on August 14, a roof fall accident occurred at the 3690 fully mechanized mining face of Qaidar Coal Mine 301, Xihai Coal Development Co., Ltd., Hot Water District, Gangcha County, Haibei Prefecture, Qinghai Province. Up to now, 2 people have been rescued, of which 1 person was killed, 1 person is not in danger of life, and 19 people are still trapped.
The reporter learned from the expert team at the scene of the accident that it has not yet made contact with the trapped personnel underground. There are four objective problems in the rescue process. The first is the poor roof of the coal mine. In the past, this was an open-pit coal mine. The rock above the general coal mine was thick or thin. This place was basically muck. The second difficulty is that the coal seam here is powdery, which softens with water, causing the slime to flow and penetrate. The third difficulty is the relatively high altitude of the accident site, which is 3844 meters above sea level. Experts and rescue team members continue to work against altitude sickness. The fourth difficulty is that this place is a frozen soil layer. Now the frozen soil layer has melted in August and the continuous rainfall has increased the difficulty of rescue.
According to experts, there are two rescue methods for mine rescue. The first is to rescue from the mine. First of all, mine rescue must be dredged. However, it is difficult to dredge the Qaidar Coal Mine. The underground coal slime makes it impossible for rescuers to rely on it. Earlier, during the first day of rescue, there were two slime bursts within two hours. Now the slime is still flowing out by itself, which increases the risk of trapped personnel and rescuers. The second type is punch rescue. On the afternoon of the 16th, Du Bingjian, a member of the expert team of the National Emergency Rescue Center and an engineer of the Rescue Center of the China Coal Geology Bureau, said in an interview: “Now our rescue plan is to drill down from the ground to make the loose grassroots level. Consolidate it, dredging and rescue underneath. Otherwise, one section will be cleared and one section will be cleared. The purpose of this drill now is to make the loose base layer firmer, and then the bottom dredging can be carried out. The white plastic underneath Cloth, a ditch was dug around the center of our current rescue. The ditch is covered with plastic sheeting to prevent rain from this recent rainy day. The surrounding water is concentrated in this tunnel. So, this The white thing is a drainage ditch to prevent the water from leaking down to cause this difficulty for our rescue work.
Especially in this kind of formation, there is no hard formation, and it is difficult to drill well. Each drilling time takes two or three days. After the well is drilled, the cement is injected again, and the cement is injected for one day. Then the cement will solidify for two days. This is another two or three days, and then it solidifies. In the future, the entire borehole will be 22 boreholes. After all the 22 boreholes are completed, there will be half a month. We use this half month to make this borehole shape and facilitate downhole dredging. , It will not continue to produce mudslides. If our work is relatively smooth, our rescue and drilling rigs will not have any problems. Under this condition, it may be faster. The current geological situation is very complicated. The underground personnel are currently In any case, we are not in contact now, but we feel that as long as there is a glimmer of hope, we must work a hundredfold to make our miners survive. ”
(Headquarters reporter Li Yawei, Ge Xiuyuan, Liu Zegeng, Wang Xiaolong, Yan Maopeng, and Liu Cheng) Return to Sohu to see more
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