|
| RX | Ri |
|
| RS | Policy (R1) |
| Public opposition (R2) |
| Force majeure (R3) |
| Contract (R4) |
| Construction term (R5) |
|
| RP | Instability at the launching hole (R6) |
| Damage to auxiliary facilities (R7) |
| Equipment damage and object strike (R8) |
| Shield machine assembly error (R9) |
|
| RL | Insufficient reinforcement at the receiving hole (R10) |
| Launching port seal failure (R11) |
| Off axis at shield launching (R12) |
| Unstable reaction frame (R13) |
| Unqualified base at the launching hole (R14) |
|
| RN | Undiscovered karst caves and obstacles (R15) |
| Improper control of shield tunnelling line (R16) |
| Unsteady working face and water gushing (R17) |
| Jack failure (R18) |
| Shield posture out of control (R19) |
| Shield tail seal failure (R20) |
| Pressure loss of slurry sump (R21) |
| Operation with pressure in warehouse (R22) |
| Unqualified mud (R23) |
| Improper grouting technology and parameters (R24) |
| Unqualified tunnel segment (R25) |
| Improper segment assembly (R26) |
| Settlement of adjacent structures (R27) |
|
| RR | Off axis at shield receiving (R28) |
| Insufficient reinforcement at the receiving hole (R29) |
| Receiving port seal failure (R30) |
| Unqualified base at the receiving hole (R31) |
| Instability at the shield receiving hole (R32) |
| Shield machine disassembly error (R33) |
|
