Risk Assessment Study on Mechanical Connecting Aisle Construction in the Bohai Mudstone Stratum with High Water Pressure

Table 4

Risk probability and consequence level criteria.

Grade	Probability of occurrence	The probability value interval	The consequences are severe heaviness	Casualties	Engineering quality	Economic loss	Environmental impact	Delays in construction
5	Frequent		Serious	Causes a small amount death of persons	Impact on maximum quality	The losses are enormous	Maximum	Delays of more than 90 days
4	Accidental		Dangerous	Lead to individual death of persons	Important impact on quality	Important	Important	Delay 60-90 days
3	Infrequent		Momentous	Causes a small amount injuries were made	Larger impact on quality	Larger	Larger	Delay 30-60 days
2	Not very frequent; Cumbersome		Not dangerous	Lead to individual injuries	Smaller impact on quality	Smaller	Smaller	Delay 10-30 days
1	Rare		Negligible	It will not cause casualties	Does not influence quality	Small	Small	Delays of less than 10 days