A pile foundation length calculation method and system

By acquiring historical hydrological data of bridge pier design parameters, calculating the maximum scour depth of the riverbed soil and reconstructing the effective stress field, and combining the dynamic iterative algorithm to calculate the side friction, the problem of pile foundation bearing capacity deviation in the existing technology is solved, and flood control safety calculation under severe hydrological disaster conditions is realized.

CN122174336AActive Publication Date: 2026-06-09CCCC THIRD HARBOR ENGINEERING CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CCCC THIRD HARBOR ENGINEERING CO LTD
Filing Date
2026-05-11
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing methods for calculating pile foundation length fail to effectively consider the coupled evolution of hydrological extreme parameters and the water-blocking characteristics of bridge piers, and neglect stress loss caused by the downcutting of the riverbed physical boundary and the stripping and unloading of the overlying soil due to flood scouring, resulting in dangerously low pile foundation bearing capacity under severe hydrological disaster conditions.

Method used

By acquiring historical hydrological data of bridge pier design parameters, the maximum flow velocity and highest water level under the preset return period are calculated, the maximum scour depth of the riverbed soil is determined as the scour reference surface, the effective stress field of the underlying soil layer is reconstructed, and the side friction is calculated by combining dynamic iterative algorithm to iteratively adjust the pile foundation depth to meet the preset load safety threshold.

Benefits of technology

Accurately calculate the scour depth of riverbed soil under flood action, quantify the nonlinear degradation of side friction, and output the optimal pile foundation length that conforms to the actual physical failure limit, avoiding bearing capacity assessment deviations and ensuring flood control safety.

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Abstract

This invention provides a method and system for calculating pile foundation length, relating to the field of pile foundation design technology. Specific steps include: calculating environmental characteristic parameters based on the maximum flow velocity and highest water level under a preset return period using the moment estimation method to accurately quantify extreme hydrological evolution trends; constructing a formula for calculating the maximum scour depth by combining water-blocking characteristic parameters to obtain the scour reference surface, thereby overcoming the defects of physical boundary failure; reconstructing the effective stress field of the underlying soil layer based on the scour reference surface and stress release logic to realistically restore the physical unloading effect; calculating the side friction resistance at each depth using nonlinear strength decay logic to accurately assess the degradation loss of pile-soil bearing capacity; and outputting the optimal pile foundation length using a dynamic step-size iterative algorithm under a preset load safety threshold, based on the preset ultimate end resistance of the pile end bearing layer, ensuring the bottom line of flood control mechanical safety while avoiding over-design of the structure.
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