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| Secondary index | Main sewage tunnel project | Shaft project |
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| A: Men | A11: weak safety awareness of shield engineering management personnel | A21: weak safety awareness of shaft engineering management personnel |
| A12: insufficient safety skills of construction personnel in shield engineering | A22: insufficient safety skills of construction personnel in shaft engineering |
| A13: improper safety protection of construction personnel in shield engineering | A23: improper safety protection of construction personnel in shaft engineering |
| A14: failure to rectify potential safety hazards of shield engineering | A24: failure to rectify potential safety hazards of shaft engineering |
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| B: Mechanical | B11: unreasonable selection of shield machine | B21: unreasonable selection of hoisting machinery |
| B12: unreasonable replacement of cutter head | B22: verticality deviation of shaped steel mold |
| B12: failure of segment assembly system of shield machine | B23: collision between grab bucket and pit wall |
| B14: failure of propulsion system of shield machine | B24: unreasonable drilling rig selection |
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| C: Material | C11: damaged segment | C21: imperfect anchor pipe grouting |
| C12: unqualified segment | C22: insufficient grid reinforcement |
| C13: unqualified grouting materials | C23: improper stacking of materials in shaft operation platform |
| C14: unreasonable segment hoisting process | C24: calculation error of slurry solidification time |
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| D: Method | D11: immature split origination technology | D21: immature reverse technique |
| D12: immature construction technology of secondary lining | D22: piping phenomenon |
| D13: unreasonable safety measures for shield construction | D23: unreasonable safety measures for shaft construction |
| D14: unreasonable safety investment in shield construction | D24: unreasonable safety investment in shaft construction |
| D15: backward installation technology of negative loop segment | D25: unreasonable layout of dewatering well |
| D16: error in setting shield tunnelling parameters | D26: error in setting drilling rig parameters |
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| E: Environment | E11: failure to effectively detect the changes in the surrounding environment of tunnel engineering | E21: failure to effectively detect the changes in the surrounding environment of shaft project |
| E12: failure to deal with the changes in the surrounding environment of tunnel engineering in time | E22: failure to deal with the changes in the surrounding environment of shaft engineering in time |
| E13: incomplete engineering geology and hydrology | E23: adverse effects of surrounding structures and buildings |
| E14: undiscovered natural holes | E24: excessive groundwater level |
| E15: undiscovered weak stratum | E25: liquefaction deformation of soil mass |
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