Analysis and control study of the influence of metro shield tunneling on bridge pile foundations in water-rich sand stratum
Based on the case study of the shield tunneling section in the Zhengzhou metro line 12 project,and by integrating parameters from the shield tunneling trial section,a refined numerical simulation computation model was established.On this basis,through comparative analysis between the simulation data and field monitoring data,this research investigates the impact on bridge pile foundation deformation and the effectiveness of the control measure when a shield passes lateral to an existing bridge structure in a water-rich sand stratum environment.The findings indicate that during the shield tunneling passes through a cluster pile foundation area,as the distance between the shield's tunnel face and the pile position decreases,both lateral and longitudinal deformations of the pile foundation would significantly increase.Notably,deformation peaks when the shield passes directly beneath the pile foundation,and then gradually recovers to a stable state as the shield moves away.In the vertical cross-section along the tunnel excavation direction,the upper part of the pile foundation exhibits a displacement trend moving away from the tunnel excavation direction,while the lower part experiences an opposite displacement phenomenon.During the process of shield crossing,due to the shielding effect of the front row of piles,the displacement characteristics of subsequent rows show a diminishing trend.Control measure was proposed to address the deformation of the soil stratum and pile foundations,and the feasibility of the control measure was validated by comparing the consistency between field measured data before and after implementation with simulated predicted data,so as to provide reference for similar relevant projects.
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