Research on Coupling Degree Model of Safety Risk System for Tunnel Construction in Subway Shield Zone

Table 10

The results of coupling degree value.

Tape	Risk coupling mode	Value
Two-factor risk coupling	The risk coupling of human and machinery factors	0.4999
	The risk coupling of human and environment factors	0.4987
	The risk coupling of human and management factors	0.5000
	The risk coupling of machinery and environment factors	0.4993
	The risk coupling of machinery and management factors	0.4999
	The risk coupling of environment and management factors	0.4991
Three-factor risk coupling	The risk coupling of human, machinery, and environment factors	0.5849
	The risk coupling of human, machinery, and management factors	0.6108
	The risk coupling of human, environment, and management factors	0.5884
	The risk coupling of machinery, environment, and management factors	0.5810
Four-factor risk coupling	The risk coupling of human, machinery, environment, and management factors	0.6997