Analysis model for deformation mechanism of strip foundation of building: Considering shear effect of down-crossing tunnel under excavation

Abstract

When the tunnel underpasses through the building, it will cause deformation and even damage to the buildings above, and the deformation of building foundation is the key to building safety. Based on the engineering case, the theoretical analysis was employed to evaluate the influence of shield tunnel underpass construction on the stability of the building, and the optimal tunneling parameters in the field construction have been obtained through the verified theoretical model and parameter analysis. First, the strip foundation of the building was simplified to the Timoshenko beam, which was taken into account the shear effect, and then the deformation displacement of the soil at the same place of strip foundation was applied to the simplified Timoshenko beam. Finally, the numerical solution of the displacement of the strip foundation was obtained by using the finite element method and verified its reliability using Euler-Bernoulli beam theoretical model, field monitoring data, and numerical simulation. Parameters analysis for the deformation and internal force of strip foundation under different types of shield machine tunneling parameters showed that the influence of the pressure of shield excavation chamber, thrust of shield, and driving speed played an important role in the deformation of the building’s strip foundation and internal force.

Keywords

down-crossing tunnel / Timoshenko beam / strip foundation / finite element method / parameters analysis

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