Analysis On Dynamic Response And Deformation Of The Tunnel Soil-Structure By Vibration Of The Subway

In resent years, Subway transportation systems have been developed rapidly inchina. However, with the development of subway construction,many negative effectsappear dues to the soil deformation and vibration caused by the subway long-termoperation have received much recently. So it is indispensable to discuss the dynamicresponses of structues and soil deformation. This paper uses the numerical simulationanalysis software ABAQUS to establish two-dimensional finite element model, a fulldynamic analysis responses of structure-soil and the soil displacement law under thelong-term load are analyzed. Some conclusions are drawn as follows:1.In time domain analysis the reference point of the speed, acceleration time historycurve,The train-induced soil surface vibrations decrease with the distance of the floorlevel to the railway track., and the soil surface vibrations in the Horizontal orientationis little than the soil surface vibrations in the Vertical orientation. In frequency domainanalyzes to get the train-induced soil surface vibrations mainly focus on the frequencythat bellow50hz. The direction of the component of the frequency components aremainly concentrated in10~20hz and between30~40hz.2.Analysis the vault, side wall and inverted arch of the tunnel lining in the internalforces and displacement time history curve. Comparing the change of the tunnellining in horizontal and vertical direction, getting that the inverted arch has the mostaffected by the axial thrust, the side wall has the most affected by the bendingmoment and the shearing force.The deformation of the tunnel lining is based invertical orientation, the maximum settlement happened in the parts of the invertedarch, the side walls’ deformation is closed to the vaults’, the whole structureperformance for sinking.3.Establish reference points of the reference in the soil around the tunnel.Analysising the displacement time history curve of all the points when there is onlysingle-pass dynamic calculation. Then increase the times of the load cycle, the soilsettlement in the early operation under the dynamic load is lager. In the run10yearsor so, the soil deformation gradually become stable. Analysising the long-termdeformation of the soil, get the biggest settlement and carries on the analysiscomparison with the measured ones. The larger area of the soil deformation is mainlyconcentrated in the soil that around the tunnel and the soil surface, The place that thedeformation of the soil basically stable is about5D(D is the diameter of the tunnel)form the tunnel center.Finally, proposing further questions to study on the basis of summarizing the wholearticle.