An analytical method for horizontal displacement of free-end pile foundations in a dual-parameter foundation model

By combining the Fourier series method with a dual-parameter foundation model, calculation formulas for the horizontal displacement and internal force of pile foundations caused by shield tunnel construction were derived. This overcomes the limitations of the Winkler foundation model, achieves efficient calculation of pile foundation deformation, and supports safety risk assessment of shield construction adjacent to pile foundations.

CN119538504BActive Publication Date: 2025-10-03CHINA RAILWAY 15TH BUREAU GROUP CORPORATION LIMITED +2
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Patent Information

Application Number
CN202411392395.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-09-30
Publication Date
2025-10-03
Estimated Expiration
2044-09-30

AI Technical Summary

Technical Problem

When calculating pile foundation deformation caused by shield tunnel construction adjacent to pile foundations, the existing technology uses the Winkler foundation model, which has limitations in reflecting soil continuity and shear properties. This results in large deviations between the calculated results and the actual results, and the analytical method relies on numerical methods, which has low calculation efficiency.

Method used

The Fourier series method is combined with a two-parameter foundation model, especially the Vlasov foundation model, to derive the calculation formulas for the horizontal displacement and internal force of an existing single pile caused by shield tunnel construction. The boundary conditions of the pile foundation are simplified to be free at both ends, and the horizontal displacement and internal force of the pile foundation are calculated using an analytical method.

Benefits of technology

The calculation efficiency is improved, the calculation process is simplified, the horizontal displacement and internal force of the pile foundation are quickly obtained through analytical methods, more stable calculation results are provided, and a theoretical basis is provided for the safety risk assessment of shield construction adjacent to pile foundations.

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Abstract

The present invention provides a method for analyzing the horizontal displacement of free-end pile foundations in a dual-parameter foundation model. The boundary conditions of pile foundations such as friction piles and isolation piles can be simplified to free-end pile foundations. Combined with the Fourier series method, a method for analyzing the horizontal displacement of free-end pile foundations in a dual-parameter foundation model is proposed. The method is used to calculate the horizontal displacement and internal force of pile foundations caused by shield construction adjacent to pile foundations. Compared with the numerical simulation method, the physical quantities required for calculation can be obtained by substituting the corresponding calculation parameters. The calculation process is simple. Compared with the theoretical method using the numerical method, the method only needs to solve the horizontal displacement of the pile end. w O 、 w L The related two-variable linear equation can be used to further obtain other unknown coefficients, which has high calculation efficiency and provides an effective theoretical method for the safety risk assessment of existing structures in shield construction adjacent to pile foundations.
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