|
| No. | Factor | Grading criteria | Remark |
| Grade | Description of criteria |
|
| u1 | Terrain | I | Low-lying area | In accordance with the relative height difference between the location of the station and the surroundings, the fuzzy values are obtained by combining with terrain analysis map and grading criteria of terrain described in the left. |
| II | Secondary low-lying area, close to low-lying area (it is no larger than 200 m in relative to the central point of the subway) |
| III | Secondary low-lying area, far away from the low-lying area (it is no smaller than 200 m in relative to the central point of the subway) |
| IV | Secondary high spot of terrain |
| V | High spot of terrain |
|
| u2 | River course | I | No river | By comprehensively considering the distance from each river in the surrounding relating to waterlogging prevention of the station, the fuzzy value is obtained by combining with grading criteria for rivers described in the left. A relatively safe value is taken for the range 200 m centered on the site, while a risk value is taken for the range beyond 200 m. |
| II | There is a river with a return period of floods of less than 50 years (unregulated) |
| III | A river exists with a 50-year return period of floods |
| IV | A river exists with a 100-year return period of floods |
| V | A river exists with a 200-year return period of floods |
|
| u3 | Rainwater facilities | I | No municipal supporting facilities, such as rainwater pipe network | By comprehensively considering various types of rainwater pipe networks around the station, the fuzzy value is obtained by combining with the grading standard for rainwater pipe networks. |
| II | Confluence system is not reformed, and the design working life of rainwater pipe networks is less than 0.5 years |
| III | Diversion system in old cities is used, with the design working life of rainwater pipe network of 0.5∼1 year |
| IV | Diversion system is adopted, with the design working life of rainwater pipe network of 1∼1.5 years |
| V | Diversion system is adopted, with the design working life of rainwater pipe network of longer than 1.5 years |
|
| u4 | Feed-water pipe | I | A main pipe for running water passes through (above DN300) and it is in the foundation pit | A fuzzy value is obtained by comprehensively considering the relative location of the pipe for running water in the station and the adjacent surrounding running water pipes (within 50 m by taking the station as the center) and possible movement and modification conditions. |
| II | A main pipe for running water passes through (above DN300), and it is outside the foundation pit |
| III | A main pipe for running water passes through (below DN300) and it is in the foundation pit. |
| IV | A main pipe for running water passes through (above DN300), and it is out of the foundation pit. |
| V | There is no pipe for running water |
|
| u5 | Groundwater | I | Groundwater is buried shallowly and has large impacts | Based on groundwater situation described in geological investigation report for the station and evaluation on the relationship between the station and groundwater, the fuzzy value is selected in grades I∼V. |
| II | — |
| III | — |
| IV | — |
| V | Groundwater is buried deeply and has slight influences. |
|
| u6 | Regional importance | I | The score of this factor is determined subjectively by professional experts according to the surrounding environment of the station. The following three aspects need to be comprehensively considered in the judgment.
(1) Location (central business district (CBD) area, inside the first ring road, inside the second ring road, inside the third ring road and outside the third ring road), pedestrian flow, and traffic conditions where the station is located.
(2) Whether the station is surrounded by important organizations, such as provincial and municipal government departments, financial centers, business and trade areas, and cultural heritage protection areas.
(3) Emergency rescue conditions including road conditions, traffic conditions, power supply, personnel organization, material allocation, etc.
By comprehensively considering the above three aspects, grade of the factor is fuzzily rated. |
| II |
| III |
| IV |
| V |
|
