Dynamic risk evaluation method for construction of subway station foundation pit beside existing building

The invention provides a dynamic risk evaluation method for construction of a subway station foundation pit beside an existing building, and belongs to the technical field of engineering tunnel construction risk evaluation. According to the method, a full-period dynamic risk factor identification and safety evaluation system is constructed based on a spherical fuzzy number, a triangular fuzzy number and a sequence preference technology similar to an ideal solution, expert coefficients are used for measuring weights judged by different experts, and consistency of expert judgment is measured based on variable coefficients. According to the method, subjective judgment of experts and field objective data are combined, an evaluation system is constructed, professional terms are converted into a matrix form based on spherical fuzzy numbers and aggregated with objective data processed by triangular fuzzy numbers, and finally high-risk factors are identified and countermeasures are made through a sequence preference