Urban rail transit risk assessment method and system based on fault tree analysis

The invention discloses an urban rail transit risk assessment method based on fault tree analysis. The method comprises the following steps: (1) collecting urban rail transit operation data; (2) constructing an urban rail transit operation risk fault tree model; (3) integrating personnel, equipment, environment and management risk factors into the urban rail transit operation risk fault tree model, and evaluating risk values of disaster events at all levels by applying a weighted accident tree analysis method in combination with risk occurrence probability, loss caused by risk occurrence and evolution degree of risks along with time; (4) according to different risk values, judging early warning levels, and starting corresponding emergency measures; and (5) according to the monitoring data, obtaining a development trend and time relation graph, and realizing risk pre-judgment. According to the method, the problems that current urban rail transit disaster and risk identification and pre-judgment excessively dep