Dynamic Response Analysis on Stress and Displacement of the Shield Tunnel Structure and Soil Layer under Train-Induced Vibration in Xiamen Metro Line 6

Tunnel engineering develops rapidly. To study the dynamic response of shield tunnel structure and its bottom soil layer caused by metro train operation, a three-dimensional finite-difference calculation method is used to establish tunnel-soil coupling model based on project Maluan Central Station-Jimei Island Station Xiamen Metro Line 6, operation calculated. The results show that: Under action train-induced vibration, mainly bears compressive stress generates deformation. represents significant increasing trend with enhancement vibration load. same load strength, change amplitude not obvious structural stiffness, gradually increasing, displacement weakening. deeper depth at structure, weaker layer. improving, but has stage characteristic. does obviously increase in increases, becomes weak. In general, investigation subway under important practical significance for maintaining long-term safe tunnels.