Safety Risk Assessment Study Of Subway Shield Construction Based On Fuzzy Comprehensive Evaluation

With the rapid development of China's economy,the development of urbanization is also accelerating,and the subsequent subway construction has entered a period of rapid development.The construction of urban subway not only alleviates the current situation of urban traffic congestion,but also plays a positive role in promoting the sustainable development of the national economy.Shield method is one of the underground construction method fully mechanized construction methods,with its little vibration,low noise,fast construction,etc are widely used in subway construction,but the shield construction technology is complex,and the construction environment variable,there are many potential safety hazard in the process of actual construction,will be affected by any carelessness,society bring huge losses to the enterprise.Therefore,it is necessary to evaluate the safety risk of subway shield construction,find out the hidden danger in public process in time,strengthen the safety control ability,and ensure the smooth progress of subway project.By analyzing relevant theories and background at home and abroad,this paper firstly introduces the shield construction theory,safety risk of shield construction,accident cause and other relevant theories,which lays a theoretical foundation for the establishment of the index system and the selection of evaluation model.Secondly,based on the risk assessment theory and the characteristics of metro engineering,the risk factors of shield construction safety are analyzed,and the safety evaluation index system of shield construction safety is established.Thirdly,this paper analyzes the feasibility of the fuzzy evaluation theory in evaluating subway construction safety,constructs the subway construction safety risk evaluation model based on the fuzzy comprehensive evaluation,and USES the analytic hierarchy process to obtain the weight of different indexes.Finally,the index system and evaluation model are applied to the project of Fuzhou subway line 6,and the rationality and scientificity of the model are verified,and corresponding improvement measures are put forward according to the evaluation results.