When digging a subway tunnel, I met the foundation of the building. How to avoid this situation?

Will have a certain degree of influence. However, it is unlikely to cause security problems. Subway is a major infrastructure project. China has developed rapidly in recent years, and many cities have started to build subways. So far, more than 30 cities have opened subways, and many cities are still under construction.

First of all, there will be some settlement, so if it is not well controlled, it may cause uneven settlement of the house and cracks. The usual method is to control the tunnel by grouting into the soil when digging it.

Then there is the problem of vibration, mainly comfort, which hardly involves safety. But it will affect the precision instruments in the above-ground buildings. Precision instruments, especially optical instruments, are very sensitive to this, and the surrounding subway is basically finished. For ordinary residents, the performance is that a few houses may have vibration and discomfort. It's not out of control, just looking at flowers and doing it for free. For example, Shanghai Metro 10 Line has done its own vibration isolation under the track, which has little impact ~

When planning subway lines, priority will be given to the existing urban planning roads, so as to avoid the problems of demolition and complaints about underpassing residential or commercial buildings. Then, if the line direction conflicts with the road, it will inevitably lead to the underpass of high-rise buildings. Usually, tunnel excavation will be adopted (machines can be used to dig directly from the ground, without digging from the ground) to increase the buried depth of the tunnel, and the track will try its best to avoid the impact on the upper structure through shock absorption. If you just pass by a tall building, you can also build a subway station here, and make a passage to connect with the building through reinforcement, which is convenient to increase passenger flow.

Sometimes it is inevitable to pass under the building, and even sometimes it is necessary to pass under the pile of the original building in extreme cases, so the original pile has to be removed for displacement. The treatment method is to continue to press down the pile at a suitable location underground, and then make a hanging beam according to the design load, load the original pile on the later hanging beam, and then make an arch tunnel of the subway.

In addition, the overpass in Japan and the light rail in Chongqing cross the building ~ the design is reasonable and willing to spend money, and nothing is a problem ~