Fuzzy Comprehensive Evaluation of Risks in Subway Station Construction

In accordance with the theory of accident cause and system safety, this paper systematically analyzes various risks in subway station construction and divides them into four categories. They are: (1) risks of construction environment (including architectural complex environment, hydro-geological environment, meteorological environment, traffic flow, etc.); (2) risks of construction technique (including deformation monitoring, special safety program, safety disclosure, etc.); (3) risks of construction organization (including personnel, safety system, safety mechanism, safety culture, etc.); (4) special risks (including template, scaffold, support, electricity, hoisting, towering machine, etc.). Moreover, the paper analyzes and determines the methods and standards to judge the severity level (including slight, great, serious, very serious, and disastrous) and probability level (including very likely, likely, occasional, unlikely, and very unlikely), to research the method of calculating every single risk value r_i through consequence rating a_i and probability rating f_i of each risk accident. On this basis, it considers using risk weight (w_Ri) and expert weight (w_Ei) for comprehensive evaluation of project risks. Additionally, the paper explores the method of applying the results of project risk evaluation and studies reasonable application of the project’s single risk ranking management, dynamic management of risks, and integrated assessment value of risks. By taking People’s Square Station of Metro Line 1 in Shijiazhuang City, Hebei Province, China for example, the paper applies expert scoring method and analytical calculation method to analyzing single risk and evaluating the project’s comprehensive risks, which is of great significance to safety management and risk control in similar subway station constructions.