Received: February 2, 2021
Accepted: March 2, 2021
Publication Date: June 12, 2021

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

ABSTRACT

In the process of subway tunnel construction, the traditional design method of foundation pit support has less selection of calculation parameters, so it has relatively simple experience and cannot accurately express the complex characteristics of the soil. Based on the finite element analysis, this paper simulates the construction process of the subway tunnel and uses the time-history analysis method to analyze the seismic response of the tunnel soil structure. Moreover, this paper uses the fast Fourier algorithm to perform Fourier transform on the bottom input of the finite element model and the surface acceleration time history curve and studies the variation of peak acceleration with soil depth. In addition, this paper considers the mesh size of the finite element model, the selection of dynamic artificial boundaries and system damping ratio, and simulates various tunnel construction processes. Finally, this paper designs a controlled experiment to verify the performance of this method. The research results show that the predicted value obtained by the method proposed in this paper is very close to the actual value, so the method proposed in this paper is practical and effective.

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Keywords: Finite element analysis, subway tunnel, construction simulation, simulation