|
| Cause | Rank | Severity index | Related classifications |
|
| Complicated geological conditions | 1 | 74.38 | Environment |
| National policy for subway tunnel construction | 2 | 73.81 | External |
| Progressing payments delay by the owner | 3 | 71.72 | Owner |
| Award the project to lowest bid price | 4 | 71.16 | External |
| Shortage in construction material | 5 | 71.05 | Material |
| Lack of equipment efficiency | 6 | 69.85 | Equipment |
| Shortage of advanced large equipment | 7 | 69.52 | Equipment |
| Low productivity of laborers | 8 | 68.25 | Labor |
| Postponement of the project by the owner | 9 | 68.21 | Owner |
| Poor terrain condition and wall rock quality | 10 | 67.55 | Environment |
| Delay in providing construction materials | 11 | 66.47 | Owner |
| Late land handover to the contractor by the owner | 12 | 66.25 | Owner |
| Ineffective scheduling of the project by the contractor | 13 | 65.6 | Contractor |
| Lag in technology | 14 | 65.5 | External |
| Delays in decision making by the owner | 15 | 64.56 | Owner |
| Changes in material types and specifications during construction | 16 | 63.26 | Material |
| Low skill level of equipment-operator | 17 | 63.18 | Labor |
| Limited construction area | 18 | 62.93 | External |
| Change orders by the owner during construction period | 19 | 62.25 | Owner |
| Insufficient laborers | 20 | 61.87 | Labor |
| Conflict between the contractor and other parties | 21 | 61.28 | Contractor |
| Poor financial status of the owner | 22 | 61.12 | Owner |
| Difficulties in financing the project by the contractor | 23 | 61.01 | Contractor |
| Material loss in the process of transportation | 24 | 60.17 | Material |
| Serious damage to the equipment | 25 | 59.85 | Equipment |
| Poor communication between the owner and other construction parties | 26 | 57.95 | Owner |
| Delay of inspection by the consultant | 27 | 57.58 | Consultant |
| Increasing prices of raw materials | 28 | 56.3 | Material |
| Undefined scope of working | 29 | 54.62 | Owner |
| Inflexibility of the consultant | 30 | 53.86 | Consultant |
| Changing of bankers’ policy for loans | 31 | 52.72 | External |
| Late design works | 32 | 52.51 | Designer |
| Late issuing the approval documents by the owner | 33 | 52.38 | Owner |
| Personal conflicts among laborers | 34 | 50.37 | Labor |
| Poor communication between the consultant and other construction parties | 35 | 49.25 | Consultant |
| Rework because of errors during construction | 36 | 48.71 | Contractor |
| Poor communication by the contractor with other construction parties | 37 | 47.18 | Contractor |
| Inconvenient site access | 38 | 47.06 | External |
| Conflict between laborers and management team | 39 | 46.91 | Labor |
| Mistake in design | 40 | 46.58 | Designer |
| Improper construction method | 41 | 46.38 | Contractor |
| Weather condition | 42 | 46.14 | Environment |
| Disturbance to public activities | 43 | 44.25 | External |
| Poor resource management | 44 | 42.4 | Contractor |
| Poor effect on the drainage system | 45 | 41.86 | Environment |
| Poor site supervision by the contractor | 46 | 41.18 | Contractor |
| Inappropriate design | 47 | 40.69 | Designer |
| Natural disaster | 48 | 38.15 | Environment |
| Incapable and insufficient inspectors | 49 | 36.85 | Consultant |
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