Numerical Simulation Study on Passive Failure of Shield Tunnel Excavation Face Based on Displacement Loading Method
In response to the stability issues of shield tunnel excavation faces,an analysis of the the strength situa-tion in excavation process was conducted,and excavation face support force loading method applicable to active and passive failure investigations of the excavation face were summarized.Taking the passive failure of a shallow-buried shield tunnel in sandy soil layer as an example,the usage of displacement loading method in numerical simu-lations was elaborated.The ultimate support force under displacement loading method,support force distribution on the excavation face,soil displacement on excavation face,and characteristics of landmark settlement are analyzed.The results indicated that the displacement loading method is more reasonable for passive failure investigations of ex-cavation face stability,and the numerical simulation results using the displacement loading method align well with the observed features of actual excavation-induced passive failure in engineering projects.
Displacement loading ethodShield tunnelExcavation face stabilityNumerical simulationPassive failure
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维普
