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

Table 13

Comparison of the third-level index data of “existing subway station.”

Third-level index	Risk assessment result	Corresponding risk grade of risk assessment	Actual engineering measurement result	Corresponding risk grade of actual measurement	Consistency
Absolute settlement value of station structure (mm)	3.5	Medium risk	5.5	Medium risk	Yes
Horizontal displacement of the station structure (mm)	2.2	Low risk	2.9	Low risk	Yes
Differential settlement of station structure deformation joint (mm)	0.8	Low risk	0.7	Low risk	Yes
Crack width of station structure (mm)	0.16	Medium risk	0.1	Medium risk	Yes
Orbital height difference (Vector value) (mm)	1.8	Low risk	0.5	Low risk	Yes
Transverse elevation difference of track (mm)	1.9	Low risk	1.7	Low risk	Yes
Void amount of track-bed (mm)	4.2	Medium risk	3.0	Medium risk	Yes
Area power outage renovation (h/times)	0.3	Low risk	0.2	Low risk	Yes
Circuit failure (times/month)	0.6	Low risk	0.5	Low risk	Yes
System blocking (h/times)	0.9	Low risk	0.6	Low risk	Yes
Pipeline damage (times/month)	1.1	Medium risk	0.7	Low risk	No
Equipment sampling pass rate (%)	97	Low risk	96	Low risk	Yes
Equipment failures (times/month)	12	Low risk	10	Low risk	Yes
Equipment renewal rate (%)	2.6	Low risk	2.1	Low risk	Yes
Equipment pending repair rate (%)	5.7	Medium risk	3.6	Low risk	No