Dynamic Risk Analysis in Metro Construction Using Statistical Process Control

Table 4

Consequences of RLA.

Risk loss classification	Probability	Frequency	Risk level
Tiny settlement for roadbed,; Tiny effect for a moving train	0.87%	Occasional	IV
More slight settlement for roadbed; Decrease of comfort for a moving train	0	Unlikely	IV
Slight settlement for roadbed; Less decrease of safety for a moving train	0	Unlikely	IV
Obvious settlement for roadbed; Decrease of safety for a moving train	0	Unlikely	III
More obvious settlement for roadbed; Failure of safety for a moving train	0	Unlikely	III