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| First-level index | Second-level index | Third-level index | Risk Grade |
| High risk | Medium risk | Low risk |
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| A Existing subway station | A1 Station structure | Absolute settlement value of station structure (mm) | ≥7 | ≥3, < 7 | |
| Horizontal displacement of the station structure (mm) | ≥5 | ≥3, < 5 | |
| Differential settlement of station structure deformation joint (mm) | ≥2 | ≥1, < 2 | |
| Crack width of station structure (mm) | ≥0.2 | ≥0.1, < 0.2 | |
| A2 Track structure | Orbital height difference (Vector value) (mm) | ≥4 | ≥2, < 4 | |
| Transverse elevation difference of track (mm) | ≥4 | ≥2, < 4 | |
| Void amount of track-bed (mm) | ≥5 | ≥3, < 5 | |
| A3 Power supply system | Area power outage renovation (h/times) | ≥2 | ≥0.5, < 2 | |
| Circuit failure (times/ month) | ≥3 | ≥1, < 3 | |
| A4 Water supply and drainage system | System blocking (h/times) | ≥5 | ≥2, < 5 | |
| Pipeline damage (times/month) | ≥3 | ≥1, < 3 | |
| A5 Ventilation and signal system | Equipment sampling pass rate (%) | < 60 | ≥60, < 90 | ≥90 |
| Equipment failures (times/month) | ≥30 | ≥15, < 30 | |
| Equipment renewal rate (%) | ≥7 | ≥3, < 7 | |
| Equipment pending repair rate (%) | ≥10 | ≥5, < 10 | |
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| | | Information monitoring equipment failures (times/month) | ≥10 | ≥5, < 10 | |
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| B New subway station | B1 Construction monitoring of existing station | Accuracy rate of feedback real-time data (%) | < 90 | ≥90, < 95 | ≥95 |
| Horizontal and vertical displacement of retaining pile (wall) and top of slop (m) | 20 < Control point spacing | 10 < Control point spacing ≤20 | Control point spacing≤10 |
| Axial force of struts (pieces) | Number of struts < 3 | 3≤ Number of struts < 5 | Number of struts ≥5 |
| Anchor tension (pieces) | Number of anchors < 3 | 3≤ Number of anchors < 5 | Number of anchors≥5 |
| Ground settlement (m) | 8 < Control point spacing | 3 < Control point spacing ≤8 | Control point spacing ≤3 |
| Clearance convergence of shaft support structure (m) | 5 < Monitoring section spacing | 3 < Monitoring section spacing ≤5 | Monitoring section spacing ≤3 |
| Monitoring hole of groundwater level (pieces) | Number of monitoring holes < 4 | 4≤Number of monitoring holes < 6 | 6≤Number of monitoring holes |
| B2 New space enclosing structure | Survey spot arrangement spacing (m) | ≥15 | ≥10, < 15 | |
| Lateral displacement of space enclosing structure (mm) | ≥20 | ≥10, < 20 | |
| B3 Engineering dewatering | Stratum filtering flow (permeability coefficient cm/s) | ≥ | ≥, < | < |
| Sand content control (10000−1) | 1/1 < Fine sand content | 1/2 < Fine sand content ≤1/1 | Fine sand content ≤1/2 |
| B4 Foundation pit excavation | Foundation pit excavation plan | Unreasonable | Reasonable and partially meeting standards. | Reasonable and meeting standards |
| Depth of foundation pit (m) | ≥20 | ≥10, | |
| Design of station structure | Insufficient survey, no precise calculation and design | Moderately sufficient survey, calculation and design | Full survey, accurate calculation and design |
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| B New subway station | B5 Surrounding rock and soil mass and surrounding environment | Stratum and geological condition | Complex topography and geomorphology, strong development of adverse geological conditions | Moderately complex topography and geomorphology, moderate development of adverse geological conditions | Simple topography and geomorphology, good geological condition |
| Site classification | Class III | Class II | Class I |
| Soil liquefaction grade | Serious | Moderate | Slight |
| Buried depth (m) | ≥16 | ≥10, | |
| Effect of water level reduction on stratum (m) | Inadequate dewatering for foundation excavation | Groundwater level drops to 0-1m below foundation pit bottom | Groundwater level drops below the foundation pit bottom to more than 1m |
| Impact of surrounding buildings on construction | Distance within 0.7 times the buried depth of baseplate | Distance within 0.7-1 times the buried depth of baseplate | Distance within 1-2 times the buried depth of baseplate |
| B6 Construction technology management of main structure | Stiffness and deformation reinforcement of main structure | Unreasonable grouting parameters, not meeting the actual construction | Moderately reasonable grouting parameters, meeting the actual construction | Reasonable grouting parameters, in line with the actual construction |
| Stiffness of initial support (N/) | Bond strength of sprayed concrete < 0.6 | 0.6≤ Bond strength of sprayed concrete<0.8 | Bond strength of sprayed concrete≥0.8 |
| Quality of secondary lining | Not meeting the requirements, bad effect | Moderately meeting the requirements, better effect | Meeting the requirements, good effect. |
| Mechanical operation | Improper mechanical operation | Moderately proper mechanical operation | Proper mechanical operation |
| Construction personnel management | Unqualified in construction operation, no job disclosure | Qualified in construction operation, with job disclosure and | Skilled in construction operation, with job |
| | and daily training | periodic training | disclosure and daily training |
| Emergency plan | No emergency plan, no emergency drill plan | Lack of maneuverability and failure to organize drills as planned | Standardized and targeted and success to organize drills as planned. |
| B7 Green construction | Ground traffic control (thousand vehicles/h) | ≥5 | ≥3, | |
| Noise control (dB) | 70 < Daytime, | 70≤ Daytime , | Daytime ≤ 60, |
| 55 < Nighttime | 55≤ Nighttime | Nighttime ≤ 45 |
| Sewage control (mg/L) | Suspend solid ≥400 | 250≤ Suspend solid | Suspend solid |
| Light pollution control (W/) | ≥11 | ≥10, | |
| Dust control (m) | Enclosure height | 2≤Enclosure height | 2.5≤Enclosure height |
| Construction trash control (%) | Percentage of recovery and reuse | 20≤Percentage of recovery and reuse | 30≤Percentage of recovery and reuse |
| Impact on business climate (ten thousand person-time/month) | | ≥10, | ≥20 |
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