Analysis of Effect on Existing Crack in Subway Tunnel Bring by Local Leakage
With the increase of operating mileage and service life of urban shield tunnels in China,vari-ous defects represented by crack and leakage have appeared in many tunnel structures.In order to en-sure the safety of tunnel operation and comprehensively consider the coupling effect of multi-defects,taking cracks and leakage water diseases as the research object,the numerical analysis was used to study the influence of local leakage on shield tunnel with cracks.Firstly,the mechanism of stress state change of cracked tunnel caused by local leakage was discussed,and the influence of water leak-age on the evolution of existing crack under different factors such as different amount of leakage,leak-age location and leakage time was further analyzed.Finally,the law of the influence on the stress growth of crack tip by different leakage factors was obtained.The research results summarize the evo-lution law of existing crack caused by local leakage of the tunnel,which provides an effective basis for the operation,maintenance and management of the shield tunnel.
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