Study On Tunnel Construction Risk Management Of Shield Tunneling In City C Metro Line 6

Continuously and rapidly developing the country’s economy,expanding urban areas,and escalating the "grabbing" wars in various regions,the Chinese metro network has become the first choice for various large cities to improve traffic efficiency.The Shield Method is widely applied in subway tunnel construction due to its modernized mechanization.However,in recent years,accidents have occurred frequently during the construction process without secured quality and safety,leading to numerous casualties and economic loss.Therefore,it is particularly important to study risk management during the construction of subway shield tunnels.This thesis takes the shield tunnel construction project of Metro Line 6 in City C as the research object and combines other subway lines under construction in City C to apply the WBS-RBS Method and the Expert Survey Method to identify risks and divide the shield tunnel construction into seven stages.The shield tunnel construction risks are classified into five types of risks,and the shield tunnel construction risk assessment index system is established through WBS-RBS coupling.The following occurrence probability and loss consequences of each index are estimated to obtain the membership degree and construction R=P×C risk grading evaluation matrix model.By applying the fuzzy comprehensive evaluation method to calculate the basic risk factors,the fuzzy evaluation value of each construction stage and the risk level of the target layer are obtained.Then it will be sorted according to the size of the fuzzy value of risk level;finally,based on the results of the risk assessment,specific countermeasures will be proposed to secure the safe and stable implementation in the Metro Line 6 project of City C.This thesis combines engineering examples and applies risk management related theoretical methods to conduct empirical analysis.The implementation effect verifies the feasibility and effectiveness of the research results and has reference value for risk management in the construction phase of similar projects.