Establishment and application of a metro station safety evaluation system based on extension theory.

The safety of metro stations is threatened by various types of accidents caused by both man-made and natural causes. Knowing the accurate safety status of a metro station will help managers taking countermeasures timely, thus the safety of passengers and staff members in the station can be ensured. In order to evaluate the safety status of metro stations effectively, based on the Extension Theory, a metro station safety evaluation system was established. Fire, stampedes, violence and terrorist attacks, equipment failures, floods, and earthquake were taken into consideration in the established evaluation system. The evaluation index system includes 1 first-level index, 5 second-level indexes, 15 third-level indexes, and 55 fourth-level indexes. Then the method to determine the weights of indexes was introduced, also how to determine the score and safety grade of every index, and how to calculate the safety score for the third to first level indexes based on the Extension Theory were introduced in detail. After that, a real metro station was selected to verify the operability of the established safety evaluation system, the results show the established safety evaluation system can be used for the safety evaluation of metro stations, and can help the station safety management personnel knowing the safety status better.