Wanggang Mountain Tunnel in Pu 'er, Yunnan Province collapsed. What was the main cause of the accident?

The main reason for the collapse of Pu 'er Tunnel in Yunnan Province is unknown at present.

Recently, a report about the collapse of a tunnel in Yunnan caused a heated discussion among netizens, and countless people were worried about it for a while. So what the hell is going on? According to media reports, the collapse occurred in Mojiang County, Pu 'er City, Yunnan Province. At that time, the 16th Bureau of China Railway was carrying out tunnel construction in Wanggang Mountain, but unfortunately, the tunnel suddenly collapsed, causing four workers to be trapped. After the accident, the local authorities immediately took rescue action. The rescuers included fire, public security and mine rescue teams. Up to now, the rescue team has opened the life channel? Food supply channel and breathing channel, and make sure that the four trapped people are in a safe state.

so what was the main cause of the accident? We don't know the specific reason, because the official report didn't mention the cause of the accident.

In fact, tunneling has always been very dangerous. No matter whether it is railway construction or mining, once it collapses, it may cause casualties. For example, a newly-built railway tunnel collapsed, which killed three workers and all the passengers on a buried bus. Another example is the collapse accident in guangtong-dali railway in 214, which caused six people to be trapped, and four of them survived fortunately; For example, in 211, a tunnel of Lanxin Railway in Shandan Military Racecourse collapsed, which caused ten people missing and two people killed.

So what are the reasons for these frequent accidents? I think there may be the following reasons. The first point is the improper method of tunneling, which caused the tunnel to collapse. The second point is the negligence of supervision and management personnel; The third point is that we still don't know enough about the surrounding environment of this area.

In a word, no matter what causes the tunnel collapse, it is a very urgent and dangerous accident, which needs the attention of all departments.