Risk And Fuzzy Evaluation Of Life Cycle Leakage Of Shield Tunnelling In Soft Soil Stratum

With the rapid development of social economy in China,the development of underground space in major cities is more and more in-depth.Due to the structural form of shield tunnels,construction grade,operation and maintenance,management and other reasons,water leakage of shield tunnels is particularly prominent and serious.Groundwater immersion into the tunnel seriously affects the normal use of the internal structure and ancillary facilities,reduces the service life of the tunnel,and even endangers the operation safety.Therefore,multi-index quantitative evaluation of shield tunnel leakage state in the whole life cycle stage has become an urgent problem to be solved.Based on the study of the whole life cycle leakage risk of shield tunnels,this paper creatively applies the fuzzy mathematics method to the evaluation and analysis of the leakage risk of shield tunnels in soft soil area,and systematically studies the risk assessment of the leakage of shield tunnels with the fuzzy mathematics method,so as to provide the final leakage of shield tunnels in soft soil.The determination of water risk effect provides a scientific and reasonable theoretical basis.The case study of a shield tunnel leakage project in Shanghai shows that the risk price evaluation method of shield tunnel leakage based on fuzzy mathematics theory is a scientific and reliable evaluation method,and has important theoretical research significance.Through the study of this paper,it can provide a certain theoretical guidance for the risk management of leakage of shield tunnels in soft soil area during service period,so as to better guide the engineering practice.