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

Table 5

The digital characteristics of 2nd-level indicators.

The 2nd-level indicators	Ex	En	He
Physiological factors R11	0.3250	0.1504	0.0501
Mental factors R12	0.4300	0.1416	0.0070
Technical factors R13	0.4350	0.1360	0.0424
Improper installation R21	0.4700	0.1918	0.0133
Machinery fault R22	0.4200	0.1328	0.0296
Machines in disrepair R23	0.4050	0.1592	0.0207
Natural environment factors R31	0.5300	0.1241	0.0605
Working environment factors R32	0.4900	0.1166	0.0561
Social environment factors R33	0.3600	0.1479	0.0256
Management mechanism factors R41	0.3850	0.1335	0.0192
Management organization factors R42	0.4050	0.1460	0.0153
Safety management system R43	0.4400	0.1379	0.0376