Study on the Application of the Kent Index Method on the Risk Assessment of Disastrous Accidents in Subway Engineering

Table 5

Risks or accidents identified in Section 3.

No.	Risk/accident
1	Face instability
2	Cutter head and tool wear
3	Large size bearing breaking
4	Failure of bearing seal
5	Failure of hoisting jack
6	Mud cake
7	Clogging at the exit of slurry
8	Failure of tail skin brush
9	Failure of pushing axis control
10	leakage water at the segment
11	Failure of segment erection
12	Segment uplift
13	Jammed grouting pipe
14	Bad grouting effect