Research on Construction Safety Risk Assessment of New Subway Station Close-Attached Undercrossing the Existing Operating Station

Table 10

Comprehensive correlation degree and risk grade of each second-level index.

Correlation degree				Risk grade
(A1 Station structure)	-0.061	0.021	-0.010	Medium risk
(A2 Track structure)	-0.130	0.130	-0.088	Medium risk
(A3 Power supply system)	-0.188	-0.031	0.031	Low risk
(A4 Water supply and drainage system)	-0.041	-0.004	0.001	Low risk
(A5 Ventilation and signal system)	-0.064	-0.026	0.017	Low risk
(B1 Construction monitoring of existing station)	-0.097	0.016	-0.054	Medium risk
(B2 New space enclosing structure)	-0.089	-0.024	0.031	Low risk
(B3 Engineering dewatering)	-0.022	0.024	-0.021	Medium risk
(B4 Foundation pit excavation)	-0.005	0.001	-0.015	Medium risk
(B5 Surrounding rock and soil mass and surrounding environment)	-0.020	0.003	-0.025	Medium risk
(B6 Construction technology management of main structure)	-0.136	-0.033	0.034	Low risk
(B7 Green construction)	-0.005	0.002	-0.004	Medium risk