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

Table 14

Comparison of the third-level index data of “new 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
Information monitoring equipment failures (times/month)	6.2	Medium risk	5.3	Medium risk	Yes
Accuracy rate of feedback real-time data (%)	87.5	High risk	93	Medium risk	No
Horizontal and vertical displacement of retaining pile (wall) and top of slop (m)	15	Medium risk	12	Medium risk	Yes
Axial force of struts (pieces)	6	Low risk	8	Low risk	Yes
Anchor tension (pieces)	7	Low risk	8	Low risk	Yes
Ground settlement (m)	2.5	Low risk	2	Low risk	Yes
Clearance convergence of shaft support structure (m)	4	Medium risk	5	Medium risk	Yes
Monitoring hole of groundwater level (pieces)	5	Medium risk	6	Low risk	No
Survey spot arrangement spacing (m)	12	Medium risk	9.5	Low risk	No
Lateral displacement of space enclosing structure (mm)	7.4	Low risk	4.9	Low risk	Yes
Stratum filtering flow (permeability coefficient cm/s)	2×10^5	Medium risk	3×10^5	Medium risk	Yes
Sand content control (10000^−1)	0.8	Medium risk	0.9	Medium risk	Yes
Depth of foundation pit (m)	26	High risk	25.5	High risk	Yes
Buried depth (m)	24.2	High risk	24.2	High risk	Yes
Impact of surrounding buildings on construction	0.9	Medium risk	0.9	Medium risk	Yes
Stiffness of initial support (N/)	0.81	Low risk	0.92	Low risk	Yes
Ground traffic control (thousand vehicles/h)	5.1	High risk	6.2	High risk	Yes
Noise control (dB)	daytime67	Low risk	daytime59	Low risk	Yes
	night29		night 30
Sewage control (mg/L)	293	Medium risk	262	Medium risk	Yes
Light pollution control (W/)	7	Low risk	6.2	Low risk	Yes
Dust control (m)	2.1	Medium risk	2.5	Low risk	No
Construction trash control (%)	12	High risk	18	High risk	Yes
Impact on business climate (ten thousand person-time/month)	15.8	Medium risk	12	Medium risk	Yes