Application of Fuzzy Comprehensive Evaluation Method in Risk Assessment of Excavation Engineering

Taken a subway station construction for example,the risk analysis for the subway station excavation engineering including geological,construction and environmental risk factors were identified was performed by using two-level fuzzy comprehensive evaluation method.Then,the risks were graded and the risk assessment was performed.The results show that(1) the geological risk of the subway station is three-grade,the structure design and construction risk grade is four-grade,the environmental risk grade is four-grade,and the general risk grade of the subway station is five-grade.Based on these risk grades and the specific circumstance,it is suggested that(1) specific lowering water table design and construction;(2) reinforcing pedestrian overpass,monitoring and detecting surrounding pipelines and pedestrian overpass before subway station excavation;(3) investigating the foundation and structural style of surrounding structure;and(4) monitoring and detecting surrounding pipelines.