|
| Cause | Rank | Severity index | Related classifications |
|
| National policy for subway tunnel construction | 1 | 76.52 | External |
| Complicated geological conditions | 2 | 73.62 | Environment |
| Progressing payments delay by the owner | 3 | 72.65 | Owner |
| Award the project to lowest bid price | 4 | 72.05 | External |
| Shortage of advanced large equipment | 5 | 71.08 | Equipment |
| Low productivity of laborers | 6 | 70.6 | Labor |
| Delay in providing construction materials | 7 | 69.36 | Owner |
| Postponement of the project by the owner | 8 | 68.38 | Owner |
| Limited construction area | 9 | 67.34 | External |
| Poor terrain condition and wall rock quality | 10 | 66.27 | Environment |
| Shortage in construction material | 11 | 65.71 | Material |
| Insufficient laborers | 12 | 65.42 | Labor |
| Lack of equipment efficiency | 13 | 64.49 | Equipment |
| Delays in decision making by the owner | 14 | 63.76 | Owner |
| Lag in technology | 15 | 63.21 | External |
| Conflict between the contractor and other parties | 16 | 62.82 | Contractor |
| Serious damage to the equipment | 17 | 62.31 | Equipment |
| Ineffective scheduling of the project by the contractor | 18 | 62.3 | Contractor |
| Difficulties in financing the project by the contractor | 19 | 61.95 | Contractor |
| Changes in material types and specifications during construction | 20 | 61.9 | Material |
| Low skill level of equipment-operator | 21 | 61.75 | Labor |
| Change orders by the owner during construction period | 22 | 60.82 | owner |
| Increasing prices of raw materials | 23 | 59.47 | Material |
| Poor communication by the contractor with other construction parties | 24 | 59.22 | Contractor |
| Poor financial status of the owner | 25 | 58.67 | Owner |
| Late design works | 26 | 58.26 | Designer |
| Inflexibility of the consultant | 27 | 56.82 | Consultant |
| Weather condition | 28 | 55.7 | Environment |
| Late land handover to the contractor by the owner | 29 | 55.53 | Owner |
| Material loss in the process of transportation | 30 | 55.28 | Material |
| Delay of inspection by the consultant | 31 | 54.69 | Consultant |
| Inconvenient site access | 32 | 52.3 | External |
| Undefined scope of working | 33 | 51.03 | Owner |
| Rework because of errors during construction | 34 | 50.75 | Contractor |
| Changing of bankers’ policy for loans | 35 | 50.37 | External |
| Mistake in design | 36 | 49.35 | Designer |
| Poor communication between the owner and other construction parties | 37 | 48.9 | Owner |
| Poor site supervision by the contractor | 38 | 48.02 | Contractor |
| Late issuing the approval documents by the owner | 39 | 47.83 | Owner |
| Conflict between laborers and management team | 40 | 47.39 | Labor |
| Improper construction method | 41 | 47.36 | Contractor |
| Personal conflicts among laborers | 42 | 46.52 | Labor |
| Disturbance to public activities | 43 | 46.19 | External |
| Poor resource management | 44 | 45.24 | Contractor |
| Incapable and insufficient inspectors | 45 | 43.52 | Consultant |
| Inappropriate design | 46 | 43.17 | Designer |
| Poor communication between the consultant and other construction parties | 47 | 41.57 | Consultant |
| Poor effect on the drainage system | 48 | 39.71 | Environment |
| Natural disaster | 49 | 39.09 | Environment |
|
