Why is it that tunnels and bridges don’t rip themselves apart if the land is constantly changing and shifting


For example, the Channel Tunnel between the UK and France must be shifting, right? Even if it’s only by a few centimetres each year. Wouldn’t this eventually cause a catastrophic failure?


That’s what the engineers do, is identify fault lines and make sure the tunnels don’t pass through any of those areas.

And no, the Chunnel is through one solid area of rock, and none of it is shifting. Besides, it’s 250 feet below the bottom of the channel so there isn’t really any way that a collapse or fracture that huge could happen.