Group pile foundation p-y curve correction method considering frozen soil foundation rigid shell effect

By introducing the rigid shell effect influence coefficient into the frozen soil foundation to correct the py curve, the problem of insufficient bearing capacity of the unfrozen layer in the bearing capacity analysis of pile group foundations in frozen soil areas is solved, and the analysis accuracy and design reliability are improved.

CN121328245AActive Publication Date: 2026-01-13NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Application Number
CN202511912943.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-18
Publication Date
2026-01-13
Estimated Expiration
2045-12-18

AI Technical Summary

Technical Problem

Existing methods for analyzing the horizontal bearing capacity of pile foundations in frozen soil regions fail to effectively reflect the actual bearing capacity of the unfrozen soil layer below the frozen layer, leading to a systematic overestimation of the bearing capacity. Furthermore, there is a lack of a unified description of the extent to which the horizontal bearing capacity of the unfrozen soil layer below the frozen layer is utilized.

Method used

By introducing a rigid shell effect influence coefficient and correcting the existing pile group py curve through a unified function form, and considering the horizontal bearing capacity of the unfrozen soil layer below the frozen layer in the frozen soil foundation, a general model of the pile group foundation py curve in the frozen soil foundation is constructed to quantitatively describe the weakening law of the rigid shell effect on the bearing capacity of the unfrozen layer.

Benefits of technology

It improves the accuracy and reliability of horizontal bearing capacity analysis of pile foundations in frozen soil areas, avoids systematic overestimation of the resistance of unfrozen soil, explicitly reflects the influence of freezing thickness and depth on the bearing capacity of unfrozen soil, and enhances the accuracy of design.

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Abstract

The invention relates to a pile group foundation p-y curve correction method considering the frozen soil foundation rigid shell effect. The pile group foundation p-y curve correction method comprises the steps that a foundation is divided into an upper frozen layer and a lower unfrozen layer in the depth direction; based on the average ratio of the average soil resistance of the group piles of the unfrozen soil layer at the depth z of the frozen soil field to the average soil resistance of the group piles at the depth z under the natural unfrozen foundation condition in different horizontal displacement y states, the rigid shell effect influence coefficient is obtained; introducing into a natural unfrozen foundation pile group reference p-y curve model for correction, and constructing a corrected p-y curve model of an unfrozen layer in the frozen soil foundation; and in combination with a pile group p-y curve model in a frozen layer, a total pile group foundation p-y curve model is constructed and used for horizontal bearing analysis and design of the frozen soil foundation pile group foundation, so that the weakening rule of the development degree of the rigid shell effect on the horizontal bearing capacity of an unfrozen layer is quantitatively described, and the precision of horizontal bearing analysis of the pile group foundation is improved.
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