An explosion accident occurred in Qixia Gold Mine. Where is the difficulty of gold mine rescue?

65438+ 10 22, Qixia City, Yantai, Shandong Province, the first 12 day has passed since the explosion accident occurred in Hushan Gold Mine. Of the 22 trapped miners, 10 is in relatively stable physical condition, 1 miners have no signs of life, and 1 1 missing miners are still missing.

This is a "geocentric rescue"-the trapped workers are more than 600 meters underground, and the shaft of the return air shaft for people to get up and down is seriously blocked by the explosion, and the ground drilling faces complex geological conditions. ...

65438+1October 17, the rescue made great progress: a borehole was connected with the roadway where the trapped people were located, and rescuers got in touch with some trapped workers.

This progress is not easy. The relevant person in charge of the rescue headquarters said that surface drilling faces many problems: due to complex geological conditions, structural cracks in rock formations are likely to cause drilling "sticking" and construction is difficult; After the borehole is connected with the roadway, if the water inflow is large, it will easily cause the underground water level to rise and pose a threat to the safety of trapped people; The drilling depth is large, and there are many structures, which are prone to deflection, and it is uncertain to achieve accurate penetration with the roadway.

In fact, after drilling No.3 hole to 52 1 m, it was confirmed by measurement that the deviation was 7.3 m, so it was necessary to join a new team with strong deviation control and correction ability.

The rescue is still facing great difficulties, and it is in a situation of "containment" before and "chasing troops" after.

Let's talk about "containment" first. It is difficult to clear the obstacles in the shaft, and the progress has been slow. According to the information disclosed by the emergency rescue headquarters, on June 6th 12, the clearance depth of the return air shaft was 350m; Three days later, the number 12 on 19 was still 350 meters. The relevant person in charge said that this position was seriously blocked from the wellhead, and the water supply and drainage pipelines, power supply and communication cables were intertwined and superimposed; The construction space in the shaft is narrow, the cross section of the hanging cage is small, and it is very difficult to clear obstacles.

In the aspect of ground drilling, although 1 and No.3 drilling holes have been connected with the roadway where the trapped people are located, No.2 drilling hole has been abandoned because it is stuck in the broken zone, and No.5 drilling hole cannot be rectified because it deviates from 7.3 meters. The relevant person in charge said: "It is understood that there are not many precedents for hitting a depth of 600 meters in mine rescue."

Watch "Chasing Troops" again. Chen Fei, deputy commander of the emergency rescue headquarters and mayor of Yantai, said on June 5438+08 that attention should be paid to the risks brought by the rising groundwater level. According to the drilling data and the feedback from the trapped people in the fifth middle section, the underground water seepage is serious, and the water seepage volume is about per hour 10 cubic meter, which affects the living environment of the trapped people.

The difficulty of clearing obstacles in the return air shaft is unprecedented.

He Manchao (Academician of Chinese Academy of Sciences): It is extremely difficult to clear obstacles in the return air shaft! Limited by the narrow construction site in the well, all kinds of plugs are intertwined and not fixed. The rescue headquarters brings together national experts and plans at least 10 methods. The first six methods were abandoned because of low efficiency, and the last four methods were not put into practice because of safety factors or insufficient construction experience.