A calculation method for the seismic fortification length of a tunnel portal

By analyzing the mechanical parameters of the foundation beam unit of the tunnel portal section and finite element model simulation, the seismic fortification length of the tunnel portal section was calculated, which solved the problem of unclear preset length of the tunnel portal lining and improved the safety and economy of the tunnel.

CN119720340BActive Publication Date: 2025-09-23KUNMING UNIV OF SCI & TECH
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Patent Information

Application Number
CN202411782914.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-05
Publication Date
2025-09-23
Estimated Expiration
2044-12-05

AI Technical Summary

Technical Problem

There is no clear consensus in the existing technology on how to determine the preset length of the tunnel portal lining to achieve structural optimization, which affects the safety and economy of the tunnel.

Method used

By statistically analyzing the mechanical parameters of the foundation beam unit at the tunnel portal section and establishing a random distribution function, the finite element model is used to simulate the displacement changes of the tunnel under earthquake action and calculate the seismic fortification length of the tunnel portal section.

Benefits of technology

It improves the reliability and safety performance of tunnel design, optimizes seismic design, reduces the impact of earthquakes on tunnel structures, and reduces economic losses.

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Abstract

The present invention relates to the technical field of tunnel seismic resistance, and discloses a method for calculating the seismic fortification length of a tunnel portal section. The method comprises the following steps: determining the range of the tunnel portal section; collecting and analyzing the mechanical parameters of foundation beam units in the tunnel portal section to obtain statistical analysis results and random distribution functions of the mechanical parameters; establishing a finite element model of the spatial variation distribution of the tunnel portal section by using the statistical analysis results and the random distribution functions of the mechanical parameters; introducing a tunnel lateral deformation coefficient and an axial deformation coefficient, and obtaining a displacement change of the tunnel under an earthquake based on the finite element model; performing a stress-displacement analysis on the tunnel portal section to obtain a maximum bending stress change and a maximum axial stress change of the tunnel portal, and then analyzing the obtained and determined seismic fortification length of the tunnel portal section. The present invention helps to optimize the tunnel structure design and determine the seismic fortification length of the tunnel by analyzing the stress of the foundation beam unit and the displacement change under an earthquake.
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