Abstract
The long, and larger subsea tunnel has rapidly developemented in recent years in the world. But it has much more high risk for its geological condition's complexity and uncertainty in the physical prospecting interpretation result. The collapse is one of the biggest construction risk in the long, and larger subsea tunnel project, which can easily lead to huge disaster and economic and life loss. The four-color(red, orange, yellow and green) early warning mechanism of geological hazards on collapse in subsea tunnel construction is stated in the paper. And the corresponding project preventive measures are also made according to different early warning ranks. The early warning mechanism and methods stated above have some guiding significance to similar projects.
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