ANALYSIS OF FOUNDATION SETTLEMENT CAUSED BY SUBWAY LOAD

In view of the researches on the foundation settlement problem caused by long-time subway moving load, three critical factors including the rational soil constitutive model, tunnel-foundation structure model and simulation of the subway load should be considered. In this paper, the exciting force corresponding with the manage standard of irregularity is adopted to simulate the vertical vibrating load, the spatial model associated with the plastic constitutive model is established to analyze the dynamic response of the foundation with different running times. Some conclusions could be drawn: the main of the foundation settlement is caused by the initial running; the settlement alteration trend at the bottom and top of the tunnel liner are consistent; settlement at the longitudinal middle part is bigger and decrease gradually to the two terminals; after long-time running, settlement increase at the middle part along the longitudinal direction and the recruitment decrease with the running times; because that the main of the settlement is irreversible plastic deformation, the plastic constitutive model should be used to research the settlement problem caused by the long-time loading.